ASA and PSIA Instructor
Join Date: Apr 2000
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Map For Garmin
I have a different Garmin unit, but also use the BlueCharts, which are fantastic.
I would think you want to get the appropriate Blue Chart CD Americas for the offshore areas arounf North or South America, see http://www.garmin.com/cartography/mapSource/bluechartCD.jsp
According to the Garmin website , your unit should have the Americas Highway BlueChart as the base map, giving you all the road coverage you could desire out of the box.