Ron, If you like the navigation app iNavX, then that runs well even on the first generation iPads, as well as the later ones. To supply a GPS signal, there are various units that plug into the "charging" port of the iPad. Here are the ones listed on the iNavX website: Bad Elf GPS Dual XGPS150 Universal Bluetooth GPS / Dual XGPS170 Universal Bluetooth GPS
Magellan ToughCase Or there are some free-standing GPS units that broadcast a wifi signal, which also works well. Several laptop-based navigation systems (I use MacENC on the Mac, but there are also good ones for PCs) also broadcast wifi nav information, as well as some chartplotters (like the E7 from Raymarine). iNavX lets you download free raster charters from NOAA, so once you buy the app and the GPS module, there are no further costs. You definitely do not need phone capability to use the iPad. But even the new ones are not waterproof. Eric Frank Cat's Paw C&C 35 Mk II Mattapoisett, MA
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