Raymarine stand-alone master instrument - Manual (Page 28)

Chapter 6: Calibration 25
Chapter 6: Calibration
6.1 Depth calibration
The ST30 Bidata can be programmed to display depth information in feet
or metres, set alarms for shallow and deep water and allow for keel or
waterline offsets.
To select the calibration menu, press and hold and Depth. After 2
seconds the display will show CAL.
TM
D685
BIDATA
DEPTH SPEED RESET
DEPTH
SPEED
Each press of Depth will cycle the unit through the depth calibration menu.