I have a garmin stryker 7 unit on out new boat. It can't be loaded with maps, doesn't come with any, g.p.s. is able to do waypoints and a trail but that's it. It came with boat, I'm not ready to pull the trigger on another Garmin or airmar or lowrance just yet. We have a 20 ft. hardtop ducksworth and the new unit is inside. Seems to work O.K. without an ext. antenna. That being said, I am installing our older lowrance that does have navionics maps loaded alongside of it. I realize I can't use the bottom finder on the Lowrance as the two sonars would not work next to each other, I just need maps. Do I need a "puck" type external antenna or will the Lowrance work inside of the hardtop without it? Does anyone have a Lowrance ext,. antenna for sale? Also any recommendations would be appreciated on a vhf radio as we will be offshore as well. Thanks, Bob and Melanie
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