External USB GPS Receiver

External USB GPS Receiver Waterproof GPS Receiver with magnet mount, 5 foot USB cable.
1. SiRF Star IV High Performance GPS chipset
2. High sensitivity (Tracking Sensitivity: -163 dBm)
3. Support NMEA 0183 v3.0 data protocol
4. Built-in SuperCap to reserve system data for rapid satellite acquisition
5. Super-cohesive magnet for mounting on the car
6. USB interface connection port.
7. Software to convert the USB port into a virtual COM port so it can work with these and most any other NMEA compliant mapping software