Magellan GPS 315 User Manual page 72

LMK
Longitude
Magnetic North
NMEA
OSGB
Position fix
SOG
TRN
True North
TTG
64
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.
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˚.
The direction relative to a magnetic compass
National Marine Electronics Association. A
professional organization that defines and
maintains the standard serial format used by
marine electronic navigation equipment and
computer interfaces.
A coordinate system describing only Great
Britain, similar to UTMs. Used with GRB36
datum.
Position coordinates as computed by the GPS
receiver.
Speed Over Ground. The speed at which the
receiver is moving.
Turn. Degrees or direction to turn.
The direction to North Pole from an
observer's position. The north direction on
any geographical meridian.
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.
Magellan GPS 315/GPS 320