Since the Global Positioning System (GPS) serves as a receiver and not a transmitter, passive GPS Tracking devices lack a transmission device such as a cellular uplink module that sends the GPS data from the vehicle.  Therefore, passive GPS Tracking devices, also known as data loggers, primarily function as recording devices. 

GPS data loggers have an internal flash memory, a memory card slot or a USB port. They can store GPS data gathered from the vehicle or asset to which they are attached. The stored GPS data can be downloaded into a computer for further analysis. The GPS data recorded includes speed, location, and time or how long the device remained stationary. With LandAirSea's GPS tracking systems, the stored GPS data can then be downloaded via USB port, and an animated version of the route of travel can then be viewed with Google Earth. These passive GPS tracking devices can be used by sports enthusiasts while jogging or backpacking to calculate the length and duration of a trip. They can also be used by parents for teenage tracking and by private investigators. They give the freedom of not having to physically track and monitor the target asset or vehicle closely.

Not all passive GPS tracking devices are created equal. When considering the purchase of a GPS tracking unit, comparisons should be made based on accuracy, sensitivity, frequency of sampling points, power sources, reliability, and the software that translates the data into an understandable, easy-to-use format.

The passive GPS Tracking devices offered by LandAirSea include the
GPS Tracking Key and GPS Tracking Key Pro® systems.