Hi. Does anyone have a Garmin 8212 Marine Unit ? (Or Similar, 8012, 8015,etc).

The 8212 comes with "pre-loaded" g2 marine charts.

The question is are they loaded in the units memory or are they on a card that is read by some sort of reader?

I wanted to load more than one of the "Vision" charts on the unit if possible, but do not know how these new units work with the charts.