Hi:
The basic way to find your location anywhere in the world is to use a photo
sensor.
This is the method used on tagged fish. The light level is logged and time stamped probably using a watch crystal.
When the fish is caught the logger data is read out.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html
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