Seat Sensor: In some implementations, a seat sensor can be included to engage safety features for enabling or disabling the navigation device while the vehicle is in motion. For example, while the vehicle is in motion, the seat sensor can be used to facilitate the detection of a particular payload in a one or more of the vehicle seats. In response to the detection, the navigation device 102 can engage the touch-sensitive display 100 to lock, unlock, become operable, or become inoperable, to one or more users based on the sensor trigger. As an example, the system 102 can be preconfigured to allow use of the navigation system functionality by a passenger, but not a driver. In some implementations, the configuration can be based on the seat sensor having a particular weight. For example, if weight is not detected in the passenger seat, the navigation system may be configured to disallow use of functionality related to entering new destinations or any operation that may take the driver’s attention away from the road for too long while the vehicle is in motion.