I'dLove to do something like that with my grand-daughter, charlie. there are some
proto-type kits availible, incorperate GPS for as little as $40. Seen a Garmin wrist
type unit at a grocery store last year for $29, perfectly suited.
Dont have much on disk here but few places come to mind....
Parallax
Microchip
Digi-key
Mag (Circut Cellar) always has stuff in back related
Remember x-ray glasses on bubble gum wrappers? thats them grown up kinda
Was tremendous thread here earlier in year, folks launching ballons to amazing heights
collecting data and photographing, literally, on shoestring budget.
radio control people are doing amazing things with telemetry these days, might be something there
Suppose alot depends on person at other end too, lot of good people in this world tho.
see what else I can come up with
Bill