Raymarine ST40 Owner's Handbook Manual page 37

28 ST40 Bidata Instrument Owner's Handbook
• Set the required depth offset.
• Lock the shallow alarm, to prevent unauthorised changes during
normal operation.
Power up the instrument then follow the procedure in the User
calibration flow diagram. This diagram shows the User calibration
sequence for an ST40 Bidata operating as a master instrument for both
speed and depth .