This report is based on a 9th semester project which had its focus on accounting for advantages and disadvantages about a satellite based road pricing system compared to other types of toll collection systems. This report is taken to the next level and is only focusing on road pricing based on satellite positioning. Satellite positioning has many advantages, but also a major disadvan-tage: The technology is not yet fully developed, so that positioning can be done without trouble. This complicates the use of the technology in road pricing systems, because they require great accuracy and reliability. With the use of satellite positioning it is in theory possible to collect road dependent tolls, and it is not necessary to build huge toll facilities or in other ways make interventions in the infrastructure. Around the world research is done on satellite based road pricing, and there have been made several trials. Latest in Seattle a research project was completed, where a number of participants had a OBU in their cars to see how their driving habits were affected by the road pricing. Often plans about satellite based road pricing are scrubbed because the technology cannot fulfill the requirements. In this project it has been tried to build up a model of a road pricing system that is able to calculate an accurate charge regardless of the trouble with the positioning. The model is tested by using collected GPS data from a series of taxies in Copenhagen. The results are good and especially better than the results from a test of a similar model build in the 9th semester project. The charges for 50 random trips differ in the tests between -2.63 % and 3.74 % from the correct charge, and the quartiles are -0.91 %, -0.54 % and -0.05 %. That means there is only little scattering on the deviations, and mostly it goes the right side so the motorist is not affected.