Originally Posted by Hightower
...shallow depths. It's my day for having electrical gremlings today. Now this has been happening on and off for a little while, but a close shave with a shallow bank earlier today has prompted me to get to the bottom of this.
When using the depth finder in anything deeper than 35 feet it works fine. Go shallower than this and it stops reading the bottom and displaying depth. The transducer is sikaflexed in the hull and I've used ever manual and auto setting on the unit.
Is there anywhere else I could start looking?
I'm having the same problem with my Garmin 550S, except it's critical depth is around 15ft. Below that, zilch.
The conclusion from trying a new plotter and new transducer is that the new transducer fixes nothing ... and the new plotter fixes the problem.
After checking and rechecking this several times clearly the plotter is at fault. The marine engineer I used is of the view that either the 50Hz function of the plotter is kaput, or, the plotter is not switching to or processing the 50Hz signal.
Garmin Technical agree this is a possibility and they're having the plotter back next week for investigation.