I use one of these with my Etrex H
On reading your manual I see it is a nice colour unit with USB, now you need to look in your windows Device Manager and see what Com port is allocated to it. then check in base camp to see if you can select that comport for a GPS if not try another USB socket on your computer till you find one that is supported by Base camp. "I don't have base camp loaded anymore as I don't use base camp or mapsource." so I can't test this point.
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