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I have an iPad 3 with SIM card. I concur with all the previous posters in that you don't need a SIM card while flying. Here are the options which you have:
1) iPad 3G with SIM card. You can use the internal GPS or, alternatively, connect an external GPS via Bluetooth. You can use the GPS without a SIM card. However, having a SIM card you get the benefit of updated weather reports, NOTAMS and download additional approach plates while in the air (if you have network coverage).
2) iPad 3G without SIM card. The only difference to option 1) is that you won't be online while flying. Therefore, you won't get live weather, NOTAMs, etc.
3) iPad WiFi. The iPads without the 3G option (i.e., without a slot for a SIM card) don't have an internal GPS. You will need an external GPS and connect it to your iPad via Bluetooth. Live weather, Notams, etc. won't be available either.
Using the internal GPS, I've never had a problem with GPS reception yet. I have the iPad on a knee mount and my cockpit does provide a glider type surround view of the sky.
An additional practical hint: whatever mount or holder you use for your iPad, make sure it provides adequate room for air circulation. The iPad will run hot because usually there's sun when flying, display brightness is cranked way up and other modules are running concurrently (a combination of GPS, 3G and Bluetooth).
Also, battery drain is pretty high under these conditions. I have my iPad connected to the 12V outlet on the panel. This way it's always charged. Should the panel power fail, the iPad's batter will still manage to keep it running for at least an additional 1-2 hours. Plenty in most situations.
Greetings, -- Chris.
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