76 RAYDATA Installation and Operation Handbook
SOG Speed Over Ground.
TD Time Difference. The difference in time of arrival
(measured in microseconds) of the two Loran signals, one
from the master transmitting station and the other from the
secondary.
TTG Time To Go.
VMG Velocity Made Good. The component towards your
destination based on your vessel’s current speed.
WPT Waypoint.
XTE Cross Track Error.
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