An Automotive GPS Unit employ Global Position System (GPS) information to locate your whereabouts and reference your locations from a database. Many units have a database that is updated periodically, however, others locate their information in real time as needed. This system is a form of satellite assisted navigation that enable you to determine your whereabouts on a map and provide information as to the distance of travel to arrive at your intended destination.

GPS systems originated from a technology first conceived by the Department of Defense. A system of 24 orbiting satellites transmits microwave information and this allows a receiver on Earth to communicate. This data is processed for location as well as the direction and speed. Beginning in 1983 this technology was made available for civilian use and since then, with the help of advanced cellular technology, many consumer products have evolved into the products of today.

Before you purchase your GPS device, identifying which features are most important to you is necessary. It may be ideal to choose a system that will furnish you with street level maps which can come either standard or at an additional charge depending upon service. It may prove helpful to elect this option as you need to know your present location while on the move. Also find out how often the maps you are using will be updated and that the device you choose contains a map of the area of travel.

Depending on your selection and requirements, a number of units permit you to view street detail as they match up with points of interest such as restaurants, government facilities and whatever criteria you dictate. Because store ownership changes frequently, your auto GPS unit can be either loaded directly into the system or, using WiFi, can locate the latest mapping data from the internet. At the present time there are few industry standards for navigation maps although there is a substantial consumer call for uniformity much similar to cellular phone and computer operations systems.

Many different GPS devices offer driving directions either text prompted or even voice prompted. In either case, you can receive assistance finding your position or destination with the help of the system. In the instance of voice prompted driving directions, Bluetooth accessories that connect with a laptop or PDA are also available. These innovations allow you to keep your eyes on the road at all times and leave the navigation to your GPS unit. Instead of a back seat driver, you have a front seat navigator much like road racing.