Unlike traditional GPS receivers which require separate antennas or wires, the WAAS enabled BC-337 is an integrated receiver with a built-in patch antenna designed to fit directly into the Compact Flash or PCMCIA slot. The BC-337 was designed in SiRF Star III with wireless consumer applications in mind; it will give accurate readings from up to 20 channels. The BC-337 has an exceptional accuracy of WAAS which makes it ideal for detailed turn-by-turn mapping, field mapping, crop scouting and any application not requiring high accuracy.