Amel 54 and Amel 55 owners with B&G H3000 or H5000:
Did you know that if your B&G Sonic Speed fails, there is a user-programmable setting in the H3000 & H5000 processor to use SOG from your GPS instead of SOW from your Sonic Speed Sensors and Processor? And, GPS speed is already wired to the B&G processor.
This will mean that Boat Speed will display on all instruments as SOG. If a current exists, True Wind Angle and True Wind Speed will be slightly off, but since you are not a racer, this minor variance should not bother you.
B&G H2000 and earlier models do not have this feature.
H3000 turn to page 48 in your B&G Manual
H5000 turn to page 53 in your B&G Manual