5.8 | Choosing a Zeroing Method
Selecting the correct zeroing method depends on how the current project was created and whether a suitable Benchmark is available.
The table below summarises the recommended workflow for the most common situations.
| If your project is... | Recommended zeroing method |
|---|---|
| A newly created Plane Project | No additional zeroing is normally required. Defining the Plane Origin using Use GPS establishes the Plane reference. |
| An existing Plane Project being reopened | Zero to the Plane Origin Benchmark if the alignment requires verification or the GNSS reference has changed. |
| An imported design containing Benchmarks | Zero to the supplied Benchmark Marker. This is the preferred method whenever surveyed Benchmarks are available. |
| An imported design without Benchmarks | Create a Benchmark Marker, then perform a Benchmark Zero using the newly created Benchmark. |
| An existing finished surface requiring a small alignment adjustment | Use Set Z to Current to shift the design vertically to the existing surface. This is an advanced workflow and should only be used when appropriate. |
Frequently Asked Questions
Do I need to zero a new Plane Project?
Usually not. When the Plane Origin is created using Use GPS, the Plane is aligned to the current implement position and elevation. The Origin is automatically stored as a Benchmark Marker and can be used later if the Plane needs to be re-zeroed.
Should I create another Benchmark for a Plane Project?
Not normally. The Plane Origin already serves as the primary Benchmark for the Plane.
Additional Benchmarks may be useful on very large sites where returning to the Origin is inconvenient, but they are not generally required.
Should I always use a surveyed Benchmark if one is available?
Yes. Surveyed Benchmarks provide the most repeatable project alignment and should always be preferred over creating a new Benchmark.
When should I create a new Benchmark?
Create a new Benchmark when importing a project that does not already contain one, or when establishing a permanent reference point for future verification and re-zeroing.
When should I use Set Z to Current?
Use Set Z to Current only when aligning a design to an existing finished surface or making a small vertical alignment adjustment.
It should not replace normal Benchmark Zeroing where a suitable Benchmark is available.
How often should I re-zero?
Re-zeroing is normally only required when:
- Returning to a project after a significant period of time.
- Changing or relocating the GNSS base station.
- Alignment is suspected to have changed.
- Project verification indicates the design no longer matches the ground.
Repeatedly zeroing during normal grading is generally unnecessary and may introduce unwanted alignment changes if performed on an unsuitable location.
Operator Tip: Choose one reliable Benchmark and continue using it throughout the project whenever possible. Consistently using the same reference point makes verification easier and helps maintain repeatable project alignment over time.
Once you are confident selecting the appropriate zeroing method, continue to 5.9 | Understanding Surface Layers, which explains how Level COMMAND represents design surfaces, surveyed terrain and grading progress within the Apply View.