You would be surprised how many of these are deployed.
A core of my clients are Private Investigators.
Bread and butter work for PI's (other than process serving) has historically been following suspected unfaithful partners.
Since the availability of GPS / GPRS trackers and the improvement in battery technology this model of investigation has become almost redundant.
Now when a suspiciousness wife wants to know where her husband is going she hires a GPS Tracker from a PI usual around £150 to £200 a week and pays for the PI to stealthily fit the device to the underside of the vehicle usually in the early hours of the morning.
This in itself can be a problem especially with modern cars as you need a flat metal surface to attached the tracker and be in a position where it won't get knocked off.
There is a car encyclopedia available with all the available mounting positions on the various makes and models.
Battery life on a modern tracker can be up to a month or with just GPRS up to three months if set to 30 second position update and can be monitored in real time from a browser.
Several of the PI's that I know have at any one time up to 20+ of these devices fitted to vehicles out on the road and as they make the cost of the tracker back in the first week's hire its a good money earner for little work.
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