Hi-Target V90 Plus Manual page 30

HI-TARGET
To do the following:
[Device] → [Accessibility] → [electronic bubble calibration]
V90Plus receiver placed outside the strict leveling base remain stationary
until the receiver locks satellite, ready when you are ready click on [Start]
button to bring up the calibration check box.
30
Figure 3-11
Keep the instrument in the strict
leveling base, do not move, so
that the satellite
lock. When you are ready click
"OK."
Figure 3-12
receiver