Navman Fish 4150sx GPS Receiver "finder problems range" Questions

...Finder dosen't read corectly. Start up normal, when on auto depth range and sensitivity gives me a normal picture as I move from shallow to deeper water. Once over 50 to 80 feet of water the unit ...

problem with navman 4150 fish finder Could you please help. I have a Navman 4150 fishfinder that has been working great. The last time I used it the depth numbers were showing the wrong depth and were

...finder problem when i reach speed of 10-20 mph the depth indicator goes haywire and give depth ranges of 350 to 700 feet in water that is some where in the range of 5 to 20 ft. once you stop or slow ...