I have iNavX, which is great so far, although I've only scratched the surface of using it. If you've got MacENC for your computer you can use the GPS from your iPhone via wifi. Might also work with other plotter programs that can get NMEA over wifi. I think it works both ways, too, if there's an AIS or something putting out a NMEA wifi signal, the iNavX app can use it.
I also have the app Cruiser's Nav which has a lot of great info about clearing customs/paperwork and good cruising spots, mostly for Caribbean.
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