Phantom G...
No you do not need a cell plan... the Bizer Map (Brad Goodman wrote the app) is loaded onto the ipad, so you do not need a data connection....
If you use any of the map apps... as long as the map is actually loaded onto the Ipad... the GPS does not need a data signal. For example, I use WAZE on my iphone! Great app, but you need a data signal. I downloaded the Garmin GPS (street) app for my iphone, the maps are loaded onto the phone, so you do not need a data signal. I think Garmin has a Bluewater chart of Winni that's pretty good.
Woodsy
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The only way to eliminate ignorant behavior is through education. You can't fix stupid.
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