High Wing Drifter, it certainly is a belt and braces approach!
I find the great thing with the A701 and the Mio P350 is the built in SiRF GPS.
Both units pick up a better signal (and quicker) than the Garmin 296!
My old instructor has a Mio P350. Excellent screen (better than the A701), and because you dont need a bluetooth connection, superb battery life.
Rans,
www.FlightForLife.co.uk