Cheers for the great response guys.
I am currently looking to do this with about 3/4 people at a time. (GPS things arnt cheap, and im a poor student)
Then i would get the GPS trackers back (if they arnt damaged ;) wiganwill) and pass them on to another 3/4 people.

@wools, that would be extremely helpful if you could send me those details. Would save on buying another GPS tracker. Thank you.

@wiganwill, great to have some input from a courier, would give me loads of data. Thank you.

So, so far i have:

1. chris crash
2. wiganwill
3. Sano?
4. wools (no need for a GPS tracker from me)

So, for the first trial runs im looking for one more... anybody?
Thanks again for the responses.