Beam stabilization
An omni sonar term, in plain English.
Electronically re-aiming the beam to cancel the boat's roll and pitch, so the beam stays at the tilt you set.
See it in action
The free lessons show where this shows up on a real screen: start with the learning path, try it yourself on the omni trainer, or look it up on real CSH-10 captures in the field guide. Owners and captains talk settings every day on the forum.