“Is this handheld GOS suitable for marine navigation? By marine I mean open ocean. I only travel 20 to 50 miles to get to islands I fish.”
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Possibly. According to our Marine specialists, it would be depend on the location and detail needed. as the GPSMAP 78 only comes with a worldwide basemap. You may contact support for that conversation by going to our support page here: j.mp/GRMNSupport \tw/
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