Oh, hey, that reminds me. I also use mine with an external GPS (Dual XGPS) for charts while sailing and for topo maps with Gaia GPS when I need that kind of thing.
This slim-line chartplotter flush-mounts easily in your boat and boasts an ultra-bright 5” QVGA display. The GPSMAP 520 also sports a built-in, satellite-enhanced worldwide basemap and simple, straightforward buttons and menus. You can add the optional BlueChart® g2 Vision SD card for even more enhanced features.
Built a marine navigation system as a fall-back chart plotter in the event the onboard system goes down while chartering.
After rolling my own OpenCPN on raspberian install I decide to go with Sailoog after a card corruption. The project has come a long way, Ive mounted in a Pelican case with IP67 USB ports and a touch screen. Have a USB gps antenna and an rtl-sdr dongle for AIS tracking. The whole thing is hooked up to a 20kmha battery that sits behind the screen. Works great for a whole weekend. The screen is only on when I need to look at it, otherwise it just runs and keeps my tracks for my log.
Good suggestions from others and I know this is not your use case but I'd add to anyone new to navigation or with just a casual interest: get a plastic 'emergency sextant' and try using it along with a digital watch (Casio cheap one). Davis and EBBCO do both do plastic sextants.
My small sailboat has over $5k in Garmin navigation electronics. I love that whenever I've had a problem I can almost immediately reach a knowledgeable and helpful support employee in Kansas (I think?) to help me.
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