How waterproof is a fish finder

[Volitan]

Another question aboutfish finders ( especially smaller Garmin units).

How waterproof are these really?

Has anyone ever dunked one. Did it still work? Whatabout a rollover in a kayak?

Cheers

Arron

[mii11x]

I think you should be able to get info off the manufacturers websites regarding "water proofing". Perhaps it might mention IP56 or something similar.

[benm]

I'd check the IP rating as already mentioned, but I have a Lowrance on my kayak. The navigation card slot has a rubber seal but I have made it extra water proof with some DIY tape. As for the connections, it is best to fill them with dielectric grease, don't worry, the connection will still work. This prevents corrosion on those points. I also spray some lanolin on the connections after each trip. It has copped heaps of salt water spray. I hose down the whole thing each time and haven't had a problem in 2 years, no sign off corrosion. You also have to worry about electrolysis or corrosion travelling up the wires from the battery, so also make sure that is completely sealed in a water proof case of some sort. I made my own with a switch on it, also contains a fuse.

[Volitan]

You also have to worry about electrolysis or corrosion travelling up the wires from the battery, so also make sure that is completely sealed in a water proof case of some sort. I made my own with a switch on it, also contains a fuse.

Thanks Ben, lots of good info there. I'm curious about this statement though. Do you mean that i should have the battery in a completely sealed waterproof case, even though the fishfinder unit is out in the open?

Cheers

Arron