First, I was planning on getting a helix 7...But Academy had a closeout on the 698 for 399.00 I figured if I keep si scan down to 50-55 ft I can get by so I got one,

Lets just skip the poor DI and Si images for now I'm hoping that is just settings and or transducer tweaking....

But what I cannot live with is the GPS speed jumping all over the place at trolling speed..

I did update the unit no change on erratic speed, curiously enough the speed seems to be more stable if I am viewing 2d, If I switch to mapping or split screen of any sort the speed is constant up and down.. this did not happen at all with my old 768

Anyone know if I can use a external puck with the 698? or any other suggestions?