Sitting out in your car for hours or days on end spying on someone is not the type of thing to do in this day an age. A navman vehicle tracking system is a main component in what every private investigator should have. There are such vehicle tracking devices such as Enigma, GIS, Navman, Nextel, and Trimtrac to just name a few. The time and effort it would save when the investigator is on the job is outrageous. Instead of taking hours to watch, these devices can watch for them. With real time location reports and a history report of every place the vehicle as been, investigator can not lose with this device.