Originally Posted by SV John Galt
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.
I also use a Bad Elf GPS with my IPad and Navionics and can recommend both.