Glossary
101
NMEA
National Marine Electronics Association (interconnection
standard)
SOG
Speed Over Ground. A calculation of the rate of movement
of the vessel over the 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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