Buy a GPS tracker and set it into car
Currently Gps car users are 100m and they are expected to reach 370m by 2015.
If you want to block a GPS tracker installed in your car you need to use a GPS jammer.
A GPS is very helpful for navigational and tracking uses. A GPS with you in your car can help you navigate new places quickly and with little anxiety. If your car happens to be stollen, you can use the GPS to track where it was taken to.
The GPS of your car usually returns your position with respect to latitude and longitude (x and y coordinates).
In order to install a Real Time GPS Tracker in your vehicle you need to find an always on 12v wire (consult you car's manual) and hardwire your GPS device to the car by attaching it to that 12v wire.
Miliamps aren't like volts, it should not matter how many miliamps are provided, a piece of technology will only accept what it needs, so, the answer is yes it will work.
If it is your car no, the GPS is also yours to do with as you wish.
Buy a GPS tracker and set it into car
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MOTOsafety GPS Tracker
If you are shopping around for a GPS device, it is an excellent idea to conduct a car GPS comparison before you make a decision on a GPS device purchase. By performing a car GPS comparison, you can identify the key features in each GPS device and compare them against the other GPS devices. When you do this comparison, it is often easy to see which of the many GPS devices is best for you.
Most car alarms include GPS tracking.
Portable GPS units work anywhere, in any car or handheld. A factory installed GPS unit generally cannot be moved to another car.
There are many types of car GPS to use in cars with different, specific features that are bound to suit your needs. Check out these reviews on the website, http://reviews.cnet.com/best-GPS/, where they list the top five car GPS.
An in-dash gps system would be better in a car. Handheld gps systems seem to generally have smaller screens and are made specifically for outdoor use. An in-dash gps is designed for in car use.
Currently Gps car users are 100m and they are expected to reach 370m by 2015.