Thatâs how many it takes to power a Backcountry Access beacon training park. Lynne Wolfe is keenly familiar with that number. On Jan. 16 the Yostmark Backcountry Tours ski guide grabbed anyone within armâs reach to help her stuff the bevy of batteries into eight transceivers for a new beacon search training park at the Coal Creek trailhead, the second to be installed in the Teton region this winter. The park consists of a control panel and eight transceivers that are buried in the snow. The control box contains switches that turn the transceivers on and off, allowing people to create dozens of training scenarios.