diydrones/ardupilot — pull request #1548 by jschall (2014-10-30 02:34:55+00:00)
Title: add interface & logging for ublox accuracy estimate

sAcc in particular is going to be very useful for EKF in the immediate term. vAcc may find use in correcting the barometer height. hAcc may find use in, for example, deciding whether we want to set home yet, or to add margin to the geofence.