Join Date: Jan 2013
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iPhone4 and iPad2 w/o 3G
If you're planning on 'tethering' your iPad through your phone and using the iPad for chart plotting via cell towers I'm afraid your data usage will be through the roof! I bought a 'Bad Elf' brand plug in GPS unit for my non-G iPad. $95.
It has worked well without any cell tower assistance so far. I use it with the Navionics app.
It did fail to connect for a day once but I had my iPhone as a back up.