BCA TRACKER S AVALANCHE BEACON. The BCA Tracker S avalanche transceiver has the performance, ease of use and instantaneous real-time display of the Tracker3, without motion-sensing or upgradeable software – advanced features needed by snow professionals. — Saving lives is what BCA does best. They invented the digital multi-antenna avalanche transceiver, and now are making them even more durable than ever before. BCA's Tracker avalanche transceivers are the most widely used in North America — with a reputation worldwide as the industry benchmark in ease-of-use and simplicity.