How do I Troubleshoot Inaccuracies in Stationing, Control, or Layout?

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Anytime you struggle to maintain accuracy on a jobsite, first ensure that you are working with the correct and most up-to-date digital files. Confirm this with your drafter, surveyor, or general contractor.
 
Next, verify that the in-field control conditions (whether points or linework) match the digital file you’ve been given.
 
Once these are confirmed, Hilti Construction Layout (HCL) software can help you maintain accuracy during your layout and measurement applications.

Firstly: How does HCL help check accuracy as I work?

HCL ensures full visibility and understanding of your data and layout accuracy - from start to finish. Be sure to check accuracy at each key stage of your workflow.
  1. During data import: perform basic checks to ensure data is imported correctly, such as below:
    • Use COGO applications to verify that all lines and points are imported with the correct distances and locations.
    • Use layers and CAD view to ensure all necessary elements are visible.
  2. During stationing: Observe control point and stationing errors as you station; refer to the articles below for detailed guidance by method:
  3. During Layout/Measuring Applications: Monitor deviations and measured point locations to verify accuracy against the design; refer to the relevant articles based on your workflow:
  4. After Work is Complete: export reports to better understand how work was performed and identify potential sources of inaccuracy:
    • Stationing Reports - review control points used, PPM settings, timestamps, and calculated accuracy
    • Deviation Reports - analyze staked points and their deviation from design
    • Point Exports (see bottom of linked article) - view detailed data for each point (e.g., staked location, station, prism used, PPM at time of staking)

Now, to go into more detail, please see the remainder of the article.

1. Hardware: Ensure the tool is properly calibrated

When using a total station, it’s essential to confirm that the tool is set up correctly to measure accurately.
 
Please complete the following checks:
  1. Set the correct PPM and acclimate to the weather (see this article)
  2. Verify your prism pole (if being used) is truly plumb and level (see this article)
  3. Ensure the total station is stable and secure (see this article)

  4. Run a field calibration of the tool (see this article)

If all of these are verified, your tool is ready to measure accurately.

2. Imported Files: Verify digital data using COGO applications

Many stationing and layout accuracy frustrations stem from issues with imported data.
 
Typically, the data is either:
  • Incorrectly imported (incorrect coordinates, scaling, or point files), or 
  • Correctly imported, but the in-field control conditions do not meet the design expectations.
It’s best practice to validate your digital data before moving forward. If you know your digital data is imported as-designed, accuracy issues are likely stemming from in-field conditions rather than your data.
 
Use the following tablet functions to check control point dimensions and geometry:
  1. Distance between points
  2. Line and offset
  3. Length of line, arc or circle
  4. Distance between parallel lines
  5. Angle 3 pts
Use these tools to verify the data in your file. If measurements appear incorrect digitally, they will also be incorrect in the field.
 
If you identify issues:
  • Re-import the data (it may have been imported with incorrect units), or
  • Consult with a surveyor, contractor, designer, or control manager to resolve discrepancies

3. Real-World Conditions: Verify field measurements with HCL applications

If your digital file appears correct but stationing still fails, the issue likely lies with field control points or lines. They may be incorrectly labeled or not placed according to the design.
 
HCL allows you to quickly verify field measurements without relying on formal control points.

Basic Method 1: Missing Line application

The Missing Line app acts like an advanced tape measure. It captures:
  • Horizontal distance
  • Slope
  • Height
  • Angles between points
Steps:
  1. Confirm expected distances and angles from your digital file using COGO applications above
  2. Use Missing Line to measure between field points
  3. Compare results with the design
If measurements don’t match, consult with the surveyor, GC, or designer.

Basic Method 2: Use Free Stationing and Measure and Record to see an "As Built" of your in-field control

This method helps visualize and document actual field conditions.

Steps:
  1. Create a new project - keep it blank (no CAD or point files to import)
  2. Use Free Stationing to set up arbitrarily in your workspace 
  3. Open Measure and Record 
  4. Measure key control points or relevant features
  5. Use tablet measurement tools to evaluate distances and angles
  6. Compare results with the digital design
This creates a practical “as-built” record you can share with stakeholders.

4. Perform a Basic "Test" Stationing

If you only trust a few control points (e.g., 2–3), you can still proceed and troubleshoot others.
 
Steps:
  1. Station using only verified control points
  2. Use Measure and Record to capture the assumed location of other control points
  3. Compare measured points to the designed control point locations using COGO applications listed above
Deviations (such as incorrect angles and distances between points) will clearly show which control points may be inaccurate. Share this data with your team to decide how to re-establish control.

5. Additional Backsight Checks

Once you have established an accurate stationing, backsight checks are critical for maintaining accuracy throughout the day. Beyond standard backsight checks, you can add an extra layer of control:
 
Steps:
  1. After accurate stationing, use Measure and Record to create a new reference (backsight) point
  2. Refer back to this point throughout the day (e.g., every hour) to verify accuracy
  3. Re-check the same point the next day after stationing
  4. Each time you re-check your backsight, investigate any deviations from the original measurement and review them with your team

This best practice helps you detect and correct issues early, ensuring consistent accuracy over time.

Final Thought

By combining strong data validation, proper hardware setup, and consistent in-field verification, you can quickly identify and resolve accuracy issues, keeping your layout reliable and your project on track.

 

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