As an aside I am using Flymap on a 3 G IPad. I don't use a SIM card but didn't want a second box for GPS
The GPS is amazing. I have used it the northern hemisphere and southern hemisphere and it has never dropped out. Position acquisition is under 15 seconds
The Flymap app needs some upgrades such as waypoint input and chart movement but for just over 100 pounds it beats the pants off Garmin