GPS "Smart" Antennas Q.  What makes a GPS antenna "smart"?   A.  A complete GPS receiver packaged inside of it! "Smart" Antenna packages are designed to transmit position information to another device--like a computer, radar, or plotter.  All contain a standard GPS receiver/antenna combination; some even include a differential beacon receiver (DGPS) packaged in the same small, weatherproof enclosure.  Garmin GPS 18 USB Want a GPS sensor that's designed to stand up to the marine environment but is ready for simple USB connection? The Garmin GPS 18 USB is for you.  It features an integral 12-channel GPS receiver with WAAS differential correction capability to yield position precision of less than 3 meters on average with an 8 foot cable terminated in a USB connection for power and data transfer .   Garmin TracPak 36 Garmin's GPS 36 TrackPak is a complete GPS receiver and embedded antenna designed for a wide range of applications where GPS positions are communicated to some other device.   Garmin GPS 17HVS The Garmin GPS 17HVS is designed for marine applications that require exceptional accuracy in a harsh environment.  It features an integral 12-channel GPS receiver with WAAS differential correction capability to yield position precision of less than 3 meters on average.  Its 10 meter cable is terminated in bare wires for easy installation and flexible use for serial data applications.