The DJI Naza GPS arrived today from Queensland, ordered from Quinton Marais (email@example.com). I must say his postage time is quick. I ordered it Wednesday night and it arrived at work in Melbourne Friday morning, just in time for the weekend.
The unit comes with a little 2 inch mounting pole that I guess helps elevate the GPS and Magnetometer from surrounding interference. Somewhere in the manual it talks about sensitivity to both vibration and magnetic field. I reckon the vibration would be worse when mounted on the supplied pole so I've gone with directly to the arm. I used some doubled sided foam tape to hold it on the arm.
A quick test in the backyard and it took maybe a minute from coldstart to acquire a full GPS lock. You can tell that by the colour and sequence of the flashing VU. When the controller is set to GPS mode, and before satellites are acquired, the VU will blink RED, RED, RED, GREEN. As more and more satellites are acquired, the number of RED flashes decreases until the VU flashes GREEN about once every two seconds.
No test flight to report yet.
** Update 6th July.
I've since moved the GPS onto the stick, faced it forward, entered the X,Y & Z co-ordinates and calibrated the magnetometer. It works much better now.