Is my vehicle being monitored or tracked?
We can and will locate GPS and audio and visual equipment placed on cars. GPS trackers can be difficult to locate using just a RF detector or GSM locator as they tend to not constantly transmit a signal therefore you will not be able to locate them using an ordinary RF detector unless you know exactly when they will be accessed.
If the person using the GPS tracker is accessing and pulling information from the unit (this is usually via a GPS signal) then and only then will you be able to detect the signal.
A vehicle powered tracker is normally ideal for the eavesdropper as they will not need to be accessed again in order to change the batteries.
Passive trackers or GPS loggers require more attention and are less expensive and have no monthly fees. They can be placed on the vehicle and then removed at a later stage and the information can then be transferred to the perpetrators computer.