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64 Magellan GPS 315/GPS 320
LMK Landmark. A location saved in the unit’s
memory which is obtained by entering data,
editing data, calculating data or saving a
current position. Used to create routes. Same
as a waypoint.
Longitude The angular distance east or west of the prime
meridian (Greenwich Meridian) as measured
by lines perpendicular to the parallels and
converging at the poles from 0˚to 180˚.
Magnetic North The direction relative to a magnetic compass
NMEA National Marine Electronics Association. A
professional organization that defines and
maintains the standard serial format used by
marine electronic navigation equipment and
computer interfaces.
OSGB A coordinate system describing only Great
Britain, similar to UTMs. Used with GRB36
datum.
Position fix Position coordinates as computed by the GPS
receiver.
SOG Speed Over Ground. The speed at which the
receiver is moving.
TRN Turn. Degrees or direction to turn.
True North The direction to North Pole from an
observer’s position. The north direction on
any geographical meridian.
TTG Time To Go. The measurement of how long
it will take you to arrive at your destination.
TTG is based on how fast you are moving
towards the destination and the distance
remaining.