That is totally correct Ryan. The 3G has nothing really to do with the GPS. 3G just allows you to see the live weather and live NOTAMS. This can be done by tethering to a phone,,, 3G just means Internet...... However after saying that 3G will allow for faster satellite acquisition when you turn on you iPad and use GPS. this is helpfully when you turn on more than 100 km from you last point of Turing off. 3G will tell the iPad your rough location based on cellular tower triangulation. This then helps the GPS understand satellite locations without scanning for them. This allows for faster locking of the 12 - 14 sats the iPad or external GPS locks onto... This as stated in my last post is called assisted GPS... Not totally needed as you say, but usefull at times... Having Internet via tether or 3G is great with the live weather radar running in OZrunways..... Love that program Thanks Bazz..... Gotta be nice to him as he is in my brother in laws hangar and so am I at the moment.... My hangar is full at the moment until my trike sells and a renters hangar is built....... We should have an OzRunways tips and tricks section.... Very popular program.....