Before you start

Same baseline:

• RTK Fixed GPS.
• Controller connection.
• Blade height correct.

You don't need a survey. The target is one number.

About the target

You are setting the elevation in the same frame the BM is calibrated to. If you have an established BM (e.g. from a recent survey on the same field), enter the target in survey-frame elevation. If you have raw GPS altitude only, enter that.

About the BM

If your target elevation is in survey-frame units (e.g. NAVD88 elevations from a known control point), you need a BM that reflects the survey frame. If your target is just "current ground" plus or minus an offset, you can leave the BM at zero and use the Calibrate Elevation sheet's Advanced → Zero to current GPS to capture the right number.