Had the same problem this weekend on the river, I have 6 super good tops in 13 to 21 fow, checked them for 2 days nothing so the hunt began rode 4 miles up the edge of the river with my 898 HB in 12 to 20 fow, eyes glued to the screen, nothing then all at once there they were at 11:30am marked the spot on my gps an the catch was on caught 12 nice ones in 10 min. but the wind was killing me so I decided to leave and go back Sun. morning but I come down with a stomach virus an had to come home. I think they are out in the middle chasing shad right now.That my 2 cents worth