Many of the GPS units will have a built in basemap of Alaska which will show major highways, but nothing local. Higher end Garmin and Magellan units are compatible with mapping software that is written by Garmin and Magellan. This software, depending on the version you purchase, can show topographic maps, marine navigational data, or local streets and other roadmaps. The Bushnell ONIX series allows you to download satellite aerial photos of your area to help you recognize major landmarks.
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