I have a friend that was having problems with his Lowrance GPS unit. When he first started it up in the morning, it worked fine, then an hour or so later it would lose position. After changing units and antennas a couple of times Lowrance finally suggested that he move the antenna at least 3 away from the display unit (it was about 15″ away). Bingo, that did the trick; no problems since! Evidently this doesnt occur in all cases, but be aware that it CAN occur. C.
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