My i50 Depth gauge stops working in shallow water (where I need it most). The screen shows the depth where the unit stopped working and the word LAST appears. This will happen around seven feet. Upon entering deeper water, the unit begins working properly. The instrument is about six months old. I am now in the Bahamas with five feet six inches of draft and need the shallow readout badly. Any advice on repairing or adjusting the unit would be appreciated.
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