| Geolocation (2) |  |
| Gps receiver (1) | |
| Gps system (1) | |
| Navigation systems (2) | |
| Geolocation (2) | |
| Gps receiver (1) | |
| Gps system (1) | |
| Navigation systems (2) | |
A GPS SYSTEM in the device detects when the animal wanders into the 200m-wide virtual boundary band.
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