first of all you need actual firmware for your device (use garmin webupdater)
you must know, that gpsmap60/76 devices only can show the navigation chart of an G2Vision map
all other data will not be shown, that's why G2 charts are better for you - they are much smaller, because the haven't all the features, that you can't use
G2 or G2Vision chart are used like all other charts on your device: gmapsupp.img in Garmin folder on µSD card
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