I ended up spending the extra bucks for the iPad cellular, which includes a GPS chip. Yesterday and today were the first flight tests for IGlide on the iPad mini 4. And wow is it fantastic!

Task planning, including in flight decisions about how deep to fly into a cylinder, is a breeze. You just touch the way point, move it, and IGlide instantly recalculates the task distance and ETA to finish. The map is easy to read, very detailed, and scalable in any proportion.

The only wrinkle that I didn't like is that the "glide ratio" to a waypoint is the ratio that puts you in the ground there, not the ratio that puts you there at your safety altitude. My other minor complaint is that I does not recognize a start out the top of the start cylider. But you can start the task manually, so it's a minor inconvenience, but I suppose the joy of starting out the top of the cylinder makes up for that!

Overall it's really fantastic. Maybe I'll be able to retire that old pocket pc after all.