Thanks for the input chaps. I kind of reached that dead end too. I need to be able to navigate off road, on foot, as the last plane I lost came down in a farmer's paddock about 800m from nearest dirt track. Luckily for me the low tech solution worked. I had a phone number on the plane, and somebody just happened to be walking along a dirt track and saw it go down!. I had a phone call even before I had packed up my ground station!
I might end up with a Garmin dedicated device. I was just hoping to use what was at hand.
Heres a short clip of what I do:
https://vimeo.com/35122804
Cheers
Frank