[OB] geocaching - technology makes a new hobby

Mr. FoRK fork_list@hotmail.com
Wed, 9 Jan 2002 20:57:48 -0800


>
> P.S. FoRKboy: that is an example of the use of
>      multiple GPS units. Come up with three more.

Drop one from a great height - measure the time to impact to calculate
altitude.
Do it twice more to generate an average...