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I use a Garmin GPS 72 and bought a power/data cord that I wired across to my Garmin fishfinder (250C) so they "Talk" I can display selected items on the FF screen and also set waypoints from the fishfinder.
This also saves the batteries, the 72 is the low end non mapping unit, but for me and the type of fishing I do and the inshore navagation it's used for it is the perfect unit for me.
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