What unique feature does a permanently installed GPS unit have compared to portable navigation devices?

A permanently installed GPS unit is designed for integration within a vehicle’s systems, which allows for features that are generally not available in portable navigation devices. One of the significant advantages is the Vehicle Speed Sensor (VSS) connection. This connection lets the GPS unit receive real-time speed data from the vehicle, which can enhance navigation performance by providing more accurate speed calculations and improving the routing algorithms.

Having a VSS connection enables the GPS to update its position and speed more precisely during travel, especially in scenarios where GPS signals may be weak or obstructed, such as in urban canyons or through tunnels. This real-time data improves the overall functionality of the navigation system, allowing for a more seamless driving experience.

In contrast, portable navigation devices typically do not have access to the same level of vehicle integration and rely solely on satellite signals for their navigation tasks, which can limit their performance in certain driving conditions.