GAPS - User Guide
4.3 Configuring the Acoustic Antenna
The center of the mounting flange of the GAPS acoustic antenna is taken as the position of the
CRP. The misalignments and antenna depth are calculated just after installation and must be
checked every time the vessel goes into dry dock. These parameters are:
● Misalignments: three angular offsets of the antenna’s axes compared with the boat’s
axes. They are measured during the installation process.
● GAPS depth: the distance from the CRP to the sea level.
● Lever arm for relative coordinates (for HPR400, HPR418 & HPRBCD protocols only):
If you plan to output data using these protocols, you must add a lever arm (position of
GAPSwith respect to the center of gravity of the vessel) in order to reference the position
to the center of gravity of the vessel.
It is necessary to fill the GAPS Depth field even if you use only the altitude of the
transponder for a correction of the sound velocity profile.
1. Click on the menu INSTALLATION > MECHANICAL PARAMETERS.
62 MU-GAPS-AN-005-H - November 2019
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