Hi-
I just bought a 17' Crestliner that came with a Humminbird 798 CI. I mounted the transducer on the back of the boat per the instructions and ran the cable to the unit. The GPS works fine, but the depth reads a constant zero feet. The bottom of the transducer seems to be parallel with the bottom of the boat about 20" to the right of the motor (90 HP). I will try to post pictures when I get home (and it stops raining!). Is my transducer angle just off? Is it possible to test out of the water? Thanks for helping someone who is just getting back in to fishing!