Manual for Furuno GP-1600F

[scook]

Thanks Franco - that's the one I have, and don't understand the fine points about CLUTTER, ADVANCE, Expansion Markers, TVG, etc., and thought the full manual might educate me so I could use the thing to full advantage. The following problem is something I'd like to solve, for sure.

I got the boat running and in the water (finally) and took it for a run which included the main channel of the Columbia River. We were cruising at around 25 - 30 MPH with the depth showing at 30' - 40' and all of a sudden it jumped up to 5' - 6' (it was a bowel loosening experience). I was pretty sure that couldn't have been correct (but just in case, I started following a boat with deeper draft then the V-20. It kept doing it every so often, and even knowing that it was probably not correct, it was pretty uncomfortable when it happened. I probably have some sensitivity setting wrong, and I'd like to get it cleared up. There's also supposed to be some fish finding settings, which I could really use - being not such a great fisherman, I can use all the help I can get.

Thanks again - Scott