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from About.com Tech

Geocaching With Kids

Travel Bug: Example of a Travel Bug tag with plastic toy attached.

Travel Bug Defined - GPS Travel Bug in Geocaching Game

gps.about.com

from About.com Tech

Trilateration in GPS

Trilateration in GPS: Illustration of the principle of trilateration in GPS

Trilateration in GPS

gps.about.com

from About.com Tech

Geocaching With Kids

Travel Bug: Example of a Travel Bug tag with plastic toy attached.

Travel Bug Defined - GPS Travel Bug in Geocaching Game

gps.about.com

from About.com Tech

Trilateration in GPS

Trilateration in GPS: Illustration of the principle of trilateration in GPS

Trilateration in GPS

gps.about.com