As per Meikleour. The internal GPS works fine on my knee, for which the A6 is perfectly sized. I've also got a yoke mount for it. I find the battery lasts for 8 hours of use so no need for additional charging leads - it's completely stand-alone.
Friends of mine went 'up-country' yesterday into England. Wiltshire, actually, so a really long way!. The iPad packed up after about 30 mins as it dropped the Bluetooth connection to the GPS thingy and wouldn't recover. However, they also had a Samsung A6 which performed perfectly both ways, no need for GPS 'help'.
If iPads are so great, why is there a market for a holder with cooling fans built-in and GPS dongles?
TOO