I have a 15 ft. war eagle boat .I put a 898c si transducer on it.Does anybody know why the digital readout on sonor goes crazy.If i'am in 6ft of water, it reads 6ft and then jumps to 18 to 25 .I have moved the transducer about three times .It still fluctuates up and down.It reads the bottom contour ,but the digital numbers goes crazy.You could be trolling and does same thing.Any help would be very helpful.
Wilson