A Brief Explanation of GPS Navigation

What is an in-vehicle navigation system? A simple definition is an electronic device installed in a vehicle that provides turn-by turn directions – via voice or electronic map – to a specified location. However, not all navigation systems are the same. Manufacturers have different tactics in building products to provide the necessary instructions for these products to be helpful and effective, they must be precise and work in real time. Even more importantly, these devices must be safe to use and not deter the driver's attention from the road.

Today's navigation systems are more complex and much more advanced, using not only satellites, but also other technologies such as high-speed processing from DVD or harddrive technology, gyros and information from the vehicle's electronics (speed pulse). Navigation systems take the information gathered from the satellites (location based on longitude and latitude), length of travel (speed pulse) and travel direction (gyro) to properly place the vehicle in an electronic map. The system then determines what road traveled, and instructs the user with voice prompts and (or) a highlighted route.

System Types

In Dash Mounted System - This format requires replacing the factory in dash radio with the navigation unit and LCD monitor that also functions as the radio and CD player. If the factory audio system is equipped with other factory integrated options (steering wheel radio controls, OnStar, audio amplifiers, door chime modules, etc.) additional parts and labor may be required or some factory features may be lost. This type of system usually has the best appearance in the vehicle. Depending on the manufacturer input information is done by either Touch Screen or remote control.

Surface Mount System - This format typically has the LCD monitor mounted on the dash area or center console of the vehicle (sometimes the monitor can be custom mounted in the dash without altering the factory audio system depending on the vehicle). Monitor placement is the biggest challenge due to the dashboard configuration, air bag location, drinkcup holders, glove box door and the passengers left leg. Depending on the manufacturer input information is done by either Touch Screen or remote control.