OK so I read about the problems with the GPS and thought it would be worth the trouble for the great SI. I bought the 798 and so far all it has done is frustrate me. I have adjusted the SI distance down to 50 ft. Tried different sensitivity, chart speed and I don't know what else to do. I ease by brush piles I have put in recently and I dont see them. They are six feet tall and about six feet diameter. Do I not know what I'm looking at or what ? I also have the fish symbols turned on downward sonar and haven't had the first one show up. Thanks for any help. I'm about to throw this thing in the lake!!!!!!!