diydrones/ardupilot — pull request #644 by MacDev240 (2013-10-29 02:14:01+00:00)
Title: Add NAV-DOP to get all DOP values, as Pdop is sent as Hdop currently

Add vars for NAV-DOP ubx message x04, to obtain true Hdop value as current code pulls Pdop and sends as Hdop
new vars: h_dop, p_dop, and v_dop.