4.4 | Setting Zero
What is Zeroing?
Zeroing aligns the machine's measured position with the design surface so that cut and fill values are accurate.
Before Automatic Control can operate correctly, a valid zero reference must be established. If the machine is not correctly zeroed, Level COMMAND may display incorrect cut and fill values and guide the implement to the wrong elevation.
A valid zero should be established whenever:
Beginning a new project.
Returning to a previously used project.
Changing or relocating the GNSS base station.
GNSS corrections have been unavailable for an extended period.
Cut and fill values appear incorrect.
Different project types may require different zeroing methods. The most common workflows are described below.
Zeroing a Plane Project
Plane Projects are normally zeroed during creation of the Plane itself.
When the Plane Origin is created using Use GPS, the Plane surface is aligned to the current implement position and elevation. If the Primary and Secondary Slopes are also defined using GPS positions, the Plane will automatically be aligned to those locations as well.
In most situations no further zeroing is required.
However, if the project is reopened later, GNSS corrections have changed, or a different base station is being used, the Plane may need to be re-aligned.
To re-zero a Plane Project:
Position the implement at the Plane Origin.
Place the implement on the ground surface.
Press More → Zero to Benchmark.
Select the Plane Origin marker.
Press Zero.
Level COMMAND will record and average approximately 30 seconds of GNSS data before updating the Plane position.
By default, only elevation is adjusted. Latitude and Longitude can also be adjusted if required by disabling the Elevation Only option.
Zeroing a Design with a Benchmark
Many imported designs contain one or more surveyed benchmark locations.
A benchmark is a known reference point that can be used to accurately align the machine with the design.
To zero using a benchmark:
Move the machine to the benchmark location.
Place the implement on the benchmark surface.
Press More → Zero to Benchmark.
Select the desired benchmark marker.
Press Zero.
Level COMMAND will record and average approximately 30 seconds of GNSS data before applying the alignment.
Once complete, verify that cut and fill values appear reasonable before beginning work.
Zeroing a Design without a Benchmark
If a design does not contain a benchmark, one should be created before beginning work.
Choose a location that:
Is easy to locate again later.
Will remain undisturbed throughout the project.
Represents a stable reference point.
To create a benchmark:
Press Marker from the Apply View.
Enter a name such as Benchmark, Bench, BM or MB.
Enable Create Benchmark.
Press Create.
Once the benchmark has been created, perform the standard benchmark zeroing procedure described above.
Zeroing to an Existing Surface (Advanced)
In some situations it may be desirable to align a design to an existing surface rather than a surveyed benchmark.
This method is commonly used when:
A benchmark is unavailable.
A known area of finished surface already exists.
Minor alignment adjustments are required.
Choose an area that:
Has not been disturbed.
Is known to be on grade.
Can be located again later if required.
To align the design:
Position the implement on the chosen location.
Press More → Zero to Benchmark.
Press Offsets.
Press Set Z to Current.
The design will be shifted vertically so that the current location becomes the new zero reference.
Creating a marker at this location is recommended so that it can be revisited later for verification.
Ready to Continue
Before engaging Automatic Control, verify that:
✓ A project is loaded.
✓ GNSS receivers have achieved RTK fix.
✓ COMMAND Status shows Ready to Engage.
✓ A valid zero has been established.
Continue to 4.5 | Engaging Automatic Control.