I think I have got it to work, thanks for your help Bathman. I loaded Skydemon onto the SD card and then made the unit navigate to the card to run it on start up, then got the GPS to work by trial and error with the settings. I also had a slightly loose connection on the USB port that complicated it a bit, but fixed now. Anyway, fantastic if it all works reliably. It only cost £65 and seems exactly the same as the Airspace aware that I also have (same 1 hour battery life, I just carry a power monkey. It is also not completely light readable but works fine even if you have to shade it a bit sometimes). I will keep the airspace aware as a backup. In my view 5" display is perfect for light aircraft, anything bigger and it would get in the way unless there was a spare panel to mount it on. At 5" it is fine to just stick to the canopy or even kneeboard etc.