Garmin StreetPilot 2620 Owner's Manual page 78

Reference
Adding Maps to your
StreetPilot
If information for a particular search is indeed available
in another map family, a Select Map icon will appear on
the Menu page. If this icon does not appear, then search
information is not available in the other map family (or
families).
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Menu page, touch the Select Map icon. A list of your installed maps that contains searchable cities or places
will appear on a Select Map page. Touch the map family you want the StreetPilot to use for the search, and
it will return a list of cities or places only from this map family.
Purchasing Additional MapSource Maps
You can purchase additional MapSource mapping software from Garmin and download the maps to
your pre-programmed hard drive. Your pre-installed detail maps are protected from overwriting so you
don't have to worry about accidentally deleting them.
Your pre-programmed hard drive contains approximately 512 MB of available space for your additional
maps. This amount may be reduced as data updates occur.
In order to enable additional maps, you will need your Unit ID # (see page 55) and serial # (see page i).