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Tracking devices use two main types of technology, and both have their advantages and disadvantages. GPS (Global Position System), which seem to be the more common devices uses satellites to find stolen within 20 feet. VHF devices use radio technology waves. These tend to be less accurate in order to regain a stolen vehicle and often require the police or a team of “finders” to do the work to find a vehicle stolen in a given territory.
VHF has the advantage that it can emit a signal through metal containers and underground (such as underground car parks), while GPS devices that use satellites to “visibility” can so can give a location in these situations. A GPS device manufacturer claim that their device one vehicle stolen at the end of the underground or in a metal container will follow and, of course, as soon as it comes out again!