GPS TECHNOLOGY
When people talk about "GPS," they usually mean a GPS receiver unit, however the Global Positioning System (GPS) is actually a constellation of 27 Earth orbiting satellites. The U.S. military developed and implemented this satellite network as a military navigation system, but due to commercial demand opened it up to the commercial and private sectors.
Each of the solar powered satellites circle the globe making two complete rotations every day. The orbits are arranged so that at any time, anywhere on Earth, there are always at least four satellites "visible" in the sky. A GPS receiver's job is to locate four or more of these satellites, calculate the distance to each satellite, and use this information to determine its own location. This operation is based on a simple mathematical principle called trilateration.
Once the receiver makes this calculation, it can tell you the latitude, longitude and altitude (or a similar measurement) of its current position. To make the navigation more user-friendly, most receivers will download this raw data into an application that transposes the data into a position on a map.
A standard GPS receiver will not only place you on a map at any particular location, but will also trace your path across a map as you move. The receiver stays in constant communication with GPS satellites to see how your location is changing. With this information and its built-in clock, the receiver can give you several pieces of valuable information: How far you've traveled (odometer), How long you've been traveling, Your current speed (speedometer), Your average speed and A "snail" trail showing you exactly where you have traveled across the map.
GSM & RF Beacon LOCATION BASED TECHNOLOGY 
GSM & RF Beacon Location Based Technology makes use of the existing GSM network for positioning and communication. The service provider can monitor and track any asset or registered unit on their digital maps. Combined with a RF-beacon the accuracy of the positioning is less than 1 meter indoors or outdoors. This is more accurate and therefor more suitable for tracking than GPS only based systems. GSM & RF Beacon Location Based Technology is an overall better tracking solution, by using a combination of GSM and RF technology the system makes use of the mobile phone network (GSM) to provide a macro location of an asset, once nearby the RF beacon provides accurate "Homing IN" capability to accurately locate to within 1 metre even indoors or whre standalone GPS would normally fail to get a fixed position.