Be sure Etrex has WAAS turned on, postion or hold etrex at 45 degree angle to sky to get clear shot of satellites. If U are goin in towards shore with tall trees always approach from center of lake going in towards shore as etrex will have better view of satellites. 20 degree transducer cone is 36 inch view in 10 feet of water, not much in eight feet maybe only 24 inch view? I would look for some shoreline objects to help with location, cause you are only getting a large "pizza size view". Etrex's are good units.