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Our family dog is an extremely agile and playful greyhound. While she isn't often let out of the house unintentionally, the times that she has ran free (and got lost) have been disastrous. Locating her is difficult. To assist in that, a GPS collar could locate her regardless of her speed as it provides her position several times a second, within an extensive radius.
How does it work?
Two devices: One on the collar, one with the user:
The collar determines its location via GPS and sends its Latitude and Longitude to the other device over wireless radio waves.
The handheld also uses GPS to determine its location, and having received the location of the collar, it uses trigonometry and vector addition to determine the distance between itself and the collar, as well as the cardinal direction. It then outputs an aggregate of that information to the OLED display for the user to see.
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