We do not sell the Magellan units any longer. They do a great job of displaying the maps, however many found them a little complicated to use. We only sell Garmin units but unfortunately they do not use the Navionics charts. The plus side to Garmin is their maps are signification less expensive than Navionics.
I would highly recommend using a fixed mount GPS in a boat as a handheld screen is very small and hard to navigate with on bigger water. The cost difference isn't much when going from a small handheld to a 4" screen GPS/sonar unit. Take a look at the Humminbird 386ci or the Lowrance Elite 4 units.
-Lawren
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