Depth finder troubleshooting help please

tmh

Lieutenant Junior Grade
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Aug 16, 2006
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I just installed an inexpensive depth gauge and it's acting strange. Unfortunately, i don't have the model info here so I'll describe it and the problem.

the sensor is the "puck" type glued down to the hull in the bilge area. I tried to get it fully glued with no air pockets and flat on the hull but can't be sure. The gauge unit has Hi. Low water alarms and can read ft, m.

The problem is that it normally reads OK in deeper water (over 15 ft) but then after a while seems to just start dropping the reading until it hits "0.0"..... (15,12,7,5,0.0) type thing. Sometimes that's as I get into somewhat more shallow water but not less than 7 ft.

Any idea where the problem is on this?
 
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