Small gps recievers.

[Energize]

Can you get small gms recievers for a pda that are portable, ie they can just be attached to the pda you can walk around with it, like those phone scramblers that just plug into the bottom.

 

[Larok]

I have seen one for in car gps sytems with pda's that are like 5-8cm across. they are on longish wire for dashboards. Perhaps a bluetooth one would be better for walking around. You could install it in a hat!