7 Operational Mistakes New Total Station Operators Commonly Make and Countermeasures

Here we assume total station–type instruments used to measure angles and distances, commonly referred to on building and civil engineering sites as optical surveying instruments. Optical surveying instruments are important surveying equipment used to verify positions and elevations on site, and are applied in a variety of situations such as layout marking, setting out positions, as-built verification, verifying excavation locations, and checking the alignment of structures. On the other hand, when newcomers first begin to use them, they often stumble not only over operating the instrument itself but also over setup, understanding reference points, measurement sequence, recording methods, and verification tasks.

Operational mistakes with optical surveying instruments can sometimes be resolved simply by re-measuring, but they can also lead to shifts in construction positions or rework. In particular, on-site work is often done under time pressure, and a small initial lack of checks can become a major corrective task in later stages. For this reason, when you are a newcomer it is important to be aware not only of "whether you can measure" but also of "whether you are measuring under the correct conditions," "whether records that can be checked later are being kept," and "whether the results are presented in a form that anyone can assess."

Table of Contents

• Reasons Why New Operators Are Likely to Make Operational Mistakes with Electro-Optical Total Stations

• Operator error 1: Taking measurements with inadequate mounting and alignment

• Operational error 2: Starting with rear-view settings and direction checks left ambiguous

• Operator error 3: Forgetting to check the prism constant and measurement conditions

• Operator Error 4: Entering the instrument height or target height incorrectly

• Operator error 5: Measuring without organizing measurement point names or recorded contents

• Operational error 6: Trusting measurement values without checking line-of-sight or reflection conditions

• Operational error 7: Proceeding with work after omitting confirmation measurements

• On-site approach to help new staff become familiar with the total station

• Summary: Operator errors with total stations can be reduced through systemization.

Reasons Why New Surveyors Are Prone to Operational Errors with Total Stations

The reason newcomers to total stations tend to stumble is that, although the operating procedure looks simple, in reality many prerequisites overlap. If you turn on the power, sight the point, and press the measurement button, numbers will be displayed. However, whether those numbers are correct and usable in the field depends on proper setup, leveling, backsighting, input values, point management, line of sight, and recording methods being in place. What is difficult for beginners is that the instrument produces numbers, so even when conditions are wrong it can appear at first glance that the measurement has been made correctly.

In the early stages of field experience, it can be difficult to distinguish between the fact that a measurement was taken and the judgment that it was taken correctly. For example, when a total station is set up and a survey point is observed, if coordinates and distances are displayed on the screen it can feel as though the operation was successful. However, if the backsight direction is incorrect, the instrument height input is off, or the prism settings are not matched, the displayed values may be unusable for site management. Such mistakes are difficult to notice immediately after measurement and may only become apparent as a problem during drafting or when setting out construction positions.

Work with a total station cannot be completed by instrument operation alone. It is also greatly affected by site conditions such as how the tripod is set, ground stability, the condition of reference points, the movement of nearby heavy equipment and workers, sunlight, rain and wind, traffic flow, and safety measures. Because newcomers tend to focus on screen operation, they often fail to notice that the tripod legs are sinking into soft ground, that there are obstacles in the direction used to check the centerline, or that signals with the person holding the prism are ambiguous. On-site surveying requires a broader perspective: not just the instrument’s screen, but also the area around the instrument, the vicinity of the survey points, and the overall flow of the work.

Another reason newcomers are prone to operational errors is an insufficient understanding of terminology. Words such as backsight, instrument point, sighting, setup and leveling, coordinates, elevation, instrument height, target height, and prism constant are basic to experienced personnel, but to someone handling them for the first time they can appear to have similar meanings. If operations are carried out with only a vague grasp of these terms, it’s possible to think you’re following a senior’s instructions while actually performing a different operation. Especially on site, where instructions are given in short phrases, if you haven’t organized in your mind “which point you’re looking at,” “which height you’re entering,” and “which coordinates you’re using as a reference,” mistakes due to assumptions are likely to occur.

To reduce operational mistakes with a total station, it is more important to know the locations where errors are likely to occur and to check them in the same order every time than to aim for perfect operation from the start. For newcomers, prioritizing careful pre- and post-measurement checks over measuring quickly will ultimately reduce rework across the entire task. Below, we will concretely summarize the seven operational mistakes that newcomers are especially prone to and the countermeasures for them.

Operator Error 1: Taking measurements without proper mounting and alignment

Although fundamental to total station surveying, what new operators most often struggle with first is setup and leveling. Installing the tripod, mounting the instrument, and aligning the level by watching the bubble and the electronic leveling display all take time to get used to. On site, because surrounding work is progressing, there is pressure to begin measurements quickly, and one can be tempted to think “this should be close enough” even when the leveling is a bit lax. However, a total station measures angles and distances, and instability in the setup affects measurement results. In particular, when measuring long distances or performing tasks that require accuracy—such as layout lines, foundation positions, or column locations—even a slight tilt or misalignment can lead to differences on site that cannot be ignored.

A common mistake during setup is beginning work before the tripod legs are properly secured. Even if it appears stable, the leg tips can slip on crushed stone, sink into soft soil, or shift slightly from vibrations when a worker passes nearby. Newcomers tend to concentrate on the instrument’s screen and bubble, but the first thing to check is the tripod’s stability. Check the leg spread angle, height, how firmly the legs are planted, and the ground condition at the feet, and after mounting the instrument make sure it does not wobble even when lightly touched before starting leveling.

In leveling work, you need to develop the sense of first making coarse adjustments and then making fine adjustments. Newcomers may try to force alignment using only the fine-adjustment screws, which can take a long time, but if the tripod's height or position is significantly off, fine adjustments alone will not achieve a stable level. It is faster and more reliable overall to roughly level and position the tripod legs first, and then finish up with the leveling screws. Also, if the leveling indicator changes significantly when the instrument is rotated, the initial alignment may not have been adequate. Before starting measurements, make it a habit to check that the instrument stays leveled when pointed in several directions; this will reduce installation-related mistakes.

One more thing to watch out for is rechecking during measurements. Even if the instrument’s setup and leveling were correct before measuring, conditions can change during work if people or materials touch the tripod, the ground subsides, or the instrument is shaken by the wind. Newcomers tend to assume that once it’s been aligned it will be fine until the end, but if you feel anything off during measurements you need to check the setup and leveling. In particular, if a survey point suddenly doesn’t line up, the value changes when you observe the same point, or there are discrepancies with the earlier check point, you should review the instrument’s mounting and setup before suspecting a screen operation error.

As a countermeasure, before starting measurements, confirm in an order you have decided for yourself the "tripod feet", "securing the instrument", "leveling indicator", "centering position", and "timing for reconfirmation". Rather than memorizing what a senior taught you only for that moment, make sure you can check using the same words each time; this makes it easier to avoid omissions even in tense situations. It's fine if leveling takes time when you're a newcomer. In fact, being sloppy during setup and having to re-measure wastes more time for the entire site. To learn the operation of the total station quickly, it's important at first to repeat setup and leveling carefully as a single combined task.

Operational Error 2: Starting with rear-view settings and direction checks left ambiguous

In measurements using a total station that deal with coordinates and directions, backsight setup and direction verification are important. A common stumbling block for newcomers is operating without fully understanding which point is the instrument point and which point is being used as the backsight. The backsight setup serves as the reference for the instrument to recognize the site’s orientation. If this is wrong, the positional relationships of subsequently measured points can all be shifted. Even tasks that seem to focus only on distance can be greatly affected by backsight errors when direction is part of control, so it is one of the important checks before starting measurement.

A common mistake is misreading the name of the backsight point. On site, there may be multiple reference points or temporary points with similar names. Even slight differences in notation on the drawings can correspond to stakes, nails, or markings that are close together in the field, causing you to accidentally sight a different point. Newcomers may hear a point name and start operating immediately, but you must always cross-check the drawings, the field book, the on-site markings, and your senior's instructions to confirm that the point you are looking at is really the backsight point. It is important not only that the point name matches, but also that there is no inconsistency in the positional relationships on site.

When setting the backsight, the accuracy of the sighting itself also becomes an issue. If you are not correctly viewing the center of the prism or target, if the focus is soft, or if the crosshair alignment is sloppy, the accuracy of direction confirmation will decrease. Newcomers tend to focus on pressing the measurement button and often neglect careful sighting. However, because the backsight serves as the reference for all subsequent measurements, it should be aligned more carefully than a typical survey point. When using a reflector or prism, also check that the object is not tilted, that the holder is stable, and that there are no obstacles on the line of sight.

Another common stumbling block is skipping the verification measurement after setting the backsight. Once the backsight is set, you may be tempted to proceed directly to the main measurement, but it is useful to measure known points or check points to confirm that coordinates and distances are not significantly different from what you expected. Measuring just a single check point can be enough to catch mistakes such as confusing the backsight direction or making input errors. For newcomers, when the backsight is set, rather than simply asking "Is this correct?", developing the habit of looking at the check point values and judging for yourself will deepen your understanding.

As a countermeasure, understand backsight setting not as a mere screen operation but as the task of teaching the instrument the site orientation. Visualize in your mind a diagram of the relationship among the instrument station, the backsight, and the point to be measured, and compare it with the actual site direction. By checking the point name, coordinates, sighting direction, and the results at the check point in one continuous flow, you can reduce direction errors caused by assumptions. As you become familiar with operating the total station, screen operations will speed up, but you should never omit backsight confirmation and should perform it with the same care every time.

Operator error 3: Forgetting to check the prism constant and measurement conditions

When measuring distance with an electronic distance meter (EDM), you must verify the conditions according to the reflector used and the measurement mode. A common pitfall for newcomers is taking measurements without checking the prism constant, the reflector settings, or the measurement mode. Because the instrument's screen displays a distance, it can appear that measurements are successful even if the settings are incorrect. However, if the prism, reflective sheet, or non-prism measurement conditions do not match, they can affect the measured distances and coordinates. Be especially careful if the settings from the previous use remain.

On site, the same total station is sometimes used for multiple tasks. If the previous job used different reflection conditions or changed the measurement mode, those settings may remain for the new task. Newcomers tend to trust the settings as they are when they power the instrument on, but before measuring you need to check whether the current settings are appropriate for the task at hand. The items to check will differ depending on whether the work uses a prism, a reflective sheet, or measures the object directly.

Errors related to prism constants are troublesome because they tend to be overlooked as work progresses. Large discrepancies may be noticed immediately, but depending on site conditions, a sense of inconsistency can emerge later when producing drawings or checking against known points. For newcomers, the word "constant" itself may feel abstract, but in practice it is easier to understand if you think of it as the correction conditions specific to the reflector being used. It is important to be aware that if the reflector you use changes, you also need to verify the instrument-side settings.

Also, attention must be paid to differences in measurement modes. In situations that require precise measurements, situations that require measuring many points in a short time, and situations that involve measuring the object directly, the required measurement stability and methods of verification differ. Newcomers tend to think “pressing the measurement button yields the same result,” but if the numbers are to be used for on-site management, you should confirm that the measurement conditions are appropriate before recording. If measurements are unstable, also check the target's reflectivity, distance, angle, surrounding obstacles, and weather conditions.

As a countermeasure, make it a habit before measurement to check “what is the reflective target to be used this time,” “are the instrument settings appropriate for it,” “are any previous settings still left on,” and “is the measurement mode suitable for this purpose.” For newcomers, even if you use a machine set up by a senior as-is, it is good to look at the settings screen and confirm what they mean. Once you can check the settings yourself, your understanding of the measurement results deepens and your on-site decision-making improves. Optical distance measuring instruments are high-performance devices, but they lead to reliable results only when used under the correct conditions.

Operator Error 4: Entering the instrument height or target height incorrectly

In surveys using a total station, there are situations that require entering the instrument height and the target height. Newcomers often get confused about which height to measure and where to input it. The instrument height is often treated as the height from the instrument point to the instrument’s reference position, while the target height relates to the height of the prism or target. If these are mistaken, they will affect height calculations and coordinate results, so even if the horizontal position appears correct, discrepancies may arise in elevation and height control.

A common mistake is misreading the height measured with a tape measure. On site, when people are in a hurry they can misread numbers, confuse units, or make transcription errors when copying notes. For example, they might place the decimal point incorrectly, reuse the previous value as is, or confuse it with the height of a prism held by another worker. Newcomers tend to think they are simply entering the measured number, but entering the height is an important task that affects the entire set of measurement results. Before entering it, read the value aloud to confirm it, and when necessary have the other person repeat it back—this makes it easier to prevent simple mistakes.

Care must also be taken when measuring instrument height. Depending on the tripod and the shape of the instrument, you need to confirm in advance which point to use as the reference. Placing the tape measure at an ambiguous position or measuring at an angle will make the readings unstable. In particular, newcomers may mimic a senior's actions without knowing which part of the instrument to look at. At first, it is important to learn as a set the measurement point, how to place the tape measure, how to read it, and the names of the fields to be entered.

Regarding target elevation, changes to the prism pole height are a common cause of errors. If the height was changed during measurement but the setting on the instrument was not updated, the results will be affected. Also, care is needed when another worker swaps the prism or when the height is adjusted to measure a lower position. On site, even if you think you can tell by looking at the pole’s scale, confirmations can be skipped when work gets busy. It is important to enforce the rule to always check the instrument-side setting whenever the height is changed.

As a countermeasure, handle height-related values through the series of steps: "measure", "read", "communicate", "enter", and "verify". When you are a newcomer, look at the screen after entering data and check that the current instrument height and the target height match the actual situation. For tasks where height management is important, it is also effective to measure a point with a known height to confirm. When operating a total station, it is important to always connect the numbers on the screen with the actual height on site that those numbers represent, not just rely on the displayed values.

Operational Error 5: Taking measurements without organizing measurement point names and recorded data

In work with an optical total station, organizing point names and record contents is as important as the measurements themselves. What often trips up newcomers is concentrating on measuring point after point and ending up with records that don’t make clear what was measured when reviewed later. On site there are many measurement points, including grid lines, control points, temporary points, corners of structures, excavation locations, and as-built verification points. If point names are ambiguous or the order of the records is hard to follow, confusion arises when organizing the data in the office or when creating drawings.

A common mistake is assigning similar measurement point names based on a momentary impression. For example, when measuring multiple corners of the same structure, if you don’t decide on which corner corresponds to which number on site before measuring, it becomes impossible to determine the correspondence later. Newcomers tend to think “I can tell by looking now,” but as time passes their memory of the site conditions and the measurement sequence becomes vague. Measurement point names need to be clear not only to the person who took the measurements but also to anyone who will review the data later.

In addition, insufficient notes about measurement contents can also be a problem. Even if data is saved in the total station, site conditions and the purpose of the measurements may not be adequately recorded. If you cannot tell which task a point was measured for, whether it is a temporary structure or a permanent structure, or whether the point is for verification or for use in construction, you risk mishandling the data. When you are new, do not be content with data stored only in the instrument; it is important to ensure the data can be cross-checked with the field notebook or work notes.

One thing to watch for in survey point management is when the names used on site do not match the names on the drawings. Point names that are used on site for convenience may be different in drawings or management documents. If a new employee enters the on-site name they heard as-is, it may later fail to correspond to the official management name. Before starting work, confirm the naming rules for the survey points to be used this time, and, if necessary, coordinate with senior staff or the person in charge of management to reduce confusion.

As a countermeasure, decide on how to name survey points and the recording workflow before taking measurements. Organizing the measurement order, the rules for point names, how to handle check points, how to process unnecessary points, and how to leave notes before starting work will make post‑measurement data processing much easier. If a newcomer finds it difficult to decide alone, it is reassuring to confirm before starting work by saying, "I will record using this point name," and then begin measurement. Data from a total station is only valuable if it is recorded in a usable form after measurement. It is important to consider not only measurement accuracy but also the clarity of records as part of on‑site quality.

Operator Error 6: Trusting measurement values without checking line-of-sight or reflection conditions

A total station measures distance and angles by sighting a target, so it is affected by line-of-sight and reflection conditions. What beginners often stumble over is feeling reassured when measurement values appear on the screen and trusting those numbers without adequately checking the actual line-of-sight or reflection conditions. On-site there are many factors that can affect measurements, such as rebar, scaffolding, temporary fencing, heavy machinery, materials, foot traffic, rain, fog, heat haze, and reflective surfaces. Even if it looks like a measurement is being taken, the target may not be correctly captured or the measurement values may be unstable.

A common mistake regarding line of sight is thinking you are looking at the center of the target when in fact you pick up a nearer obstruction or a different nearby surface. This is especially important when measuring through narrow gaps or in areas where materials are densely packed. Newcomers tend to assume that it's fine as long as the target is visible in the telescope, but measurements with electro-optical surveying instruments are affected by the condition along the line of sight. You need to check that there are no obstructions between you and the target, that the prism or reflective sheet is oriented correctly, and that no workers cross the line of sight during measurement.

Reflection conditions also require attention. On-site situations vary: the target surface may be inclined, wet, highly reflective, or affected by color or material so that measurements are unstable. When measuring a target directly without a prism, it is especially important to check the condition of the target surface. Even if the distance is displayed on the screen, if repeated measurements show variability, do not accept it as is; you should review the measurement method and the target position.

Trusting measurement values too much is a common mistake among newcomers. The numbers displayed by the instrument may look precise, but if site conditions are poor the results will be unstable. For example, measurements can be affected if the prism is not properly oriented at long distances, if the pole is swaying in the wind, or if the operator cannot hold the pole vertically. It is important not only to look at the measurements themselves, but also to check whether the values are stable, whether remeasuring the same point produces no large changes, and whether there are no inconsistencies with surrounding points.

As countermeasures, visually confirm the line of sight to the target before measurement, correctly sight the target during measurement, and check the stability of the readings after measurement. If even slightly anomalous values appear, make it a habit to re-measure on the spot. If you proceed thinking you can fix it later, you may end up not knowing which value is correct. Electronic total stations are convenient surveying instruments, but it is the operator who must judge field conditions. For newcomers, it is important to always cross-check the machine’s numbers with what you see in the field.

Operational Mistake 7: Skipping Confirmation Measurements and Proceeding with the Work

Once operators become a little familiar with using a total station, a common mistake newcomers make is omitting verification measurements. Even if they follow their seniors' instructions at first, after doing the work a few times they may think it's fine because the measurements appear to be successful, and skip measuring or remeasuring the check points. However, on-site surveying relies on verification measurements as the crucial process for detecting mistakes early. Errors such as incorrect backsighting, entering the wrong instrument height, setting the wrong prism conditions, tripod slippage, or mixing up survey points can often be noticed on the spot by performing verification measurements.

If you skip verification measurements, you will notice mistakes later. If you check immediately after measuring, you still remember the machine’s setup and the working conditions, so it’s easier to trace the cause and remeasure right away. However, if an anomaly is discovered during data processing after the work is finished, reproducing the site conditions becomes difficult. If a remeasurement is required after the machinery has been cleared away, it not only costs time but also increases the burden of coordinating work and ensuring safety. Verification measurements may seem like a hassle, but they ultimately protect the overall efficiency of the worksite.

One reason newcomers skip verification measurements is that they don't know how much checking is required. It is not necessary to measure every point repeatedly, but points that serve as references for the work, points that directly affect the construction position, points used for height control, and important points that will be drawn on plans later should be given high priority for verification. Also, be aware of the timing for checks: at the start of work, after touching the instrument during the process, after changing the prism height, after substantially changing the measurement direction, and whenever the measurement values feel off.

In verification measurements, it is effective not only to measure the same point again but also to compare it with known points or points in different directions. For example, after starting work, measuring a known point and checking the difference from the expected value can alert you to major mistakes in backsight or setup. If there is a discrepancy in the measurements, do not immediately assume a cause; instead, check the setup, leveling, sighting, input values, prism conditions, point names, and site movements in order. When you are a novice, you may panic and repeat operations if an abnormal value appears, but isolating causes one by one is more reliable.

As a countermeasure, verification measurements should be incorporated into the measurement process rather than being carried out at the end with leftover time. Establishing a flow of checking at the start, checking at critical points, and checking before finishing leads to early detection of mistakes. In particular, when a newcomer is responsible, having them show the verification results to a senior before proceeding to the next task reduces discrepancies in judgment. In operating a total station, being able to detect errors on site is more important than measuring quickly. A commitment to not skipping verification measurements enhances the reliability of surveying operations.

On-site approach for helping new employees become familiar with the total station

Just learning how to operate the screen is not enough to become proficient with a total station. Of course, you need to know how to turn the power on, select the measurement mode, enter point names, save data, and check coordinates. However, what is truly required on site is the ability to connect operation with the measurement conditions. By working while understanding which point you have the instrument set up on, which direction you are using as the reference, what height you are inputting, and what the measured point will be used for, you will more easily notice mistakes.

For newcomers, it is effective to verbalize and confirm the workflow before starting work. Make sure you can explain in your own words the sequence of checking the instrument station, setting up the tripod, leveling the instrument, checking the backsight, confirming the measurement conditions, entering the instrument height and the target height, measuring the check point, and then proceeding to the main measurement. If there are parts you cannot explain, that likely indicates a lack of understanding. When asking a senior, it also makes it easier to convey specifically "what you don't understand."

Also, the ability to feel when something is off about measurement results is important. A total station displays numbers, but the operator needs to verify whether those figures match what is sensed in the field. For example, if a point right in front of you feels like a much greater distance, if the direction looks unnatural for a point on the same street, or if a value differs greatly from the previous measurement—such misgivings can lead to discovering an error. Newcomers tend to accept the machine’s numbers as they are because they lack confidence, but it is important to adopt the habit of checking whenever something seems even slightly wrong.

On site, coordination with those around you is indispensable. If information sharing with the person holding the prism, the person checking the drawings, the person directing the construction position, and the person managing the movements of heavy machinery and workers is insufficient, it can lead to measurement errors and safety problems. When a newcomer operates an electronic distance meter (EDM), rather than proceeding silently, it is important to clearly communicate which point will be measured, whether measurement is in progress, whether the height has been changed, and whether confirmation is complete. Increasing verbal communication makes it easier for those around you to notice mistakes.

Furthermore, it is important to record failures and apply them to future work. While it is difficult to completely eliminate operational mistakes when you are new, you can create a system to prevent repeating the same errors. If you briefly note where you went wrong, why you didn’t notice it, and which additional checks you will add next time, your personal checklist will grow. Operating a total station becomes faster with experience, but that does not mean you can be lax with checks. Those who maintain basic checks even after becoming accustomed are able to perform surveying work more consistently.

Summary: Operator errors with total stations can be reduced by systematizing procedures

Common operational mistakes that new operators of total stations stumble over include inadequate setup and leveling, ambiguous backsight settings, insufficient checking of the prism constant and measurement conditions, input errors for instrument height and target height, poor organization of point names and records, overlooking line-of-sight and reflection conditions, and omission of verification measurements.

Each of these is basic when considered individually, but because multiple tasks often proceed simultaneously in the field, haste and assumptions make omissions and oversights more likely. For new operators, what matters is not just learning the operations quickly, but understanding where errors are likely to occur and being able to perform the same sequence of checks every time.

A total station, when used correctly, is a reliable instrument that supports the accuracy and efficiency of site management. On the other hand, if measurements are taken with incorrect settings or under wrong conditions, values that appear accurate can lead to mistaken construction decisions. For that reason, preparation before measurement, checks during measurement, and verification after measurement need to be treated as a single, continuous process. Simply enforcing the basics — stabilize the tripod, verify centering and leveling, take backsights carefully, read back entered values, organize point names, check the line of sight, and never skip verification measurements — will make it easier to reduce mistakes by new operators.

Also, when assigning total station work to a newcomer, it is important to create a system that prevents mistakes across the entire site rather than relying solely on the individual's attentiveness. Decide the order of checks before work, share rules for survey point names, have multiple people verify critical input values, standardize the measurement of check points, and include post-measurement data organization in the work procedures so that even less experienced staff can perform more consistently. Surveying quality is supported not only by a single person's skill but also by site planning and a culture of verification.

Newcomers who will be handling optical surveying instruments do not need to prioritize speed from the start. Rather, understanding step by step why each operation is performed, which conditions affect measurement results, and what checks will catch mistakes will ultimately be the quickest path to growth. The values measured on site are important information that leads to construction decisions, drafting, and as-built verification. Instead of using the numbers the machine produces as-is, adopting an attitude of checking them against site conditions is the first step to becoming a trusted surveyor.

In recent years, in addition to total stations, means to assist field surveying and recording have expanded to include GNSS survey instruments, laser scanners, and recording support using smartphones and tablets. However, no matter which equipment or method is used, the concepts of control points, orientation, elevation, and verification measurements are not rendered unnecessary. Mastering the fundamentals developed with total stations and then choosing means that match site conditions, required accuracy, the scope of work, and the intended use of the data leads to greater efficiency in construction management and more stable surveying quality.