APM 2.5,Firmware Version 2.8.1 - Yaw trim?
Disclaimer: I'm not sure where the best place to get help, so I've also entered the same question at: http://www.rcgroups.com/forums/showthread.php?t=1776457 and http://diydrones.com/group/arducopterusergroup/forum/topics/apm-2-5-firmware-version-2-8
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