The new WorldNav 7400 Truck GPS model is the latest and most versatile commercial trucker GPS offered by TeleType. In addition to all the standard WorldNav Truck GPS features found in the other WorldNav Truck GPS models, this model features a serial expansion port which then allows special accesssories to be added. Optional accessories include Traffic Antenna for unlimited use of traffic incident and congestion report. Special adapters can be added to allow you to monitor the tire pressure of your vehicle. An economical live tracking option tailored to small fleets or independents can be added as desired.