Do you mean an anti-theft system that uses GPS?
Those type of devices are hidden under the plastic trim usually in the rear of the vehicle. Most have a backup battery in case the battery is disconnected. At our dealership we install lojack and it's always in the back of the vehicle. I hope that helps.
If it's installed on your CRV it should have an antenna. Sometimes it's just a long wire that's tucked under the headliner.