You want to attach your iPad using either WiFi or Bluetooth to your cellphone,
not both.
Mobile devices use network assisted GPS, so you phone can share its GPS
information with the iPad. I do it with my iPad 2 and my cellphone. There
have been I few posts on how network assisted GPS works, so I won't repeat it
all here.
But I will say, it's slower it acquire position when you aren't in range of a
Internet connection.
If you have a handheld GPS that supports Bluetooth or WiFi, that would be the
best way to provide reliable GPS to your iPad.
I chose to go with an inexpensive NMEA 2000 GPS antenna and a NMEA to WiFi
router as my solution. Most NMEA to WiFi routers cost 500-600 but I found one
on vyacht.com that after shipping was still less than 100.00. It takes a
little wiring know how, but if you are into those types of projects it can be
an awesomely reliable and accurate GPS system and also be expandable for other
NMEA 2000 devices you might decide to add later, like a depth sounder or wind
instruments.
JamesS/V Kristy 1971 C&C 39
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