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gps help

Captain Paul,im new to this whole gps stuff,i bought a garmin striker 5 and it has a chart plotter,but it don't show any land mass,just a white screen with my boat in the middle showing where I'm going
what would be the best gps fish finder to buy that shows land mass,i fish the grand isle area
thanks steve
You have to have a GPS unit with a SD card slot and purchase the maps chart to get detailed information. I think all brands have units with this option, but the best place to check is with a dealer.
thank you
After looking into different brands and models of gps/ff units, it seems all need an additional map card for any detail in maps. Some models, for a higher price have Navionics, or C map loaded (appears to be geared to contours of inland freshwater lakes), not our constantly changing coastline. If you choose a gps without this add on the savings can be applied to a detailed map card. Wanting a google earth type background map, I Iooked at standard mapping's website and only Lowrance, Simrad and Raymarine seem compatible (Lowrance Hook -2 units are not compatible, and because of slow processor the map lags on Hook models) With my budget in the $300 range I chose the Lowrance Hook 7 without the C map(saving $50). Next faster model would have nearly doubled the price. Also purchased a micro sd card of central LA (Grand Isle to past Dularge) made and sold by someone on this sites classifieds. Just like looking at google maps.