I love all those big 20/20 displays at the mast
The good news is that all the displays seem to working and given that you can display wind
data and calibration data I think it's likely (but not certain) that the main processor is OK.
The ultrasonic speed sensors were not reliable, so it is not surprising that speed has has never worked. It can be replaced by a paddle wheel
easily, but you will need to be out of the water
. An alternative is to use the GPS
to display SOG the unit will still calculate true (ground) wind etc.
It is a coincidence that the gyro compass and depth have failed at the same time. The compass looks like it has suffered some salt water
spray at some stage. The only thing these generally share in common is the main processor, but I still think a sensor failure is more likely.
The depth sensor is cheap
. I would replace this. If it works you know the main processor is fine and you will have speed, wind and depth for the small cost of a new sensor.
The compass is expensive and this may be worth repairing once you are sure it is at fault rather than the main processor. The system will work quite well without the compass, or you can fit a simple flux gate compass, or get the information from the autopilot
If you have a B&G autopilot
or are a very keen racing
boat I would repair the gyrocompass otherwise I would fit a simpler alternative.