Update...and so the ability to use a DJI GPS with built it's in mag just using the 4 wires to the REVO is great.
Still not flying the best. mag probs, so have put the GPS up higher to see how it goes.
GPS hold and RTB and land all work but its a bit all over the place till I get the mag right.
Fly in in Acro+ mode for flips and rolls still but have failsafe to RTB and land for peace of mine.