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Magnetic North
The direction indicated by a magnetic
compass. Magnetic North moves slowly
and is currently West of Grid North in Great
Britain.
Meridian
A line of longitude.
MGRS
Military Grid Reference System, used by
NATO countries. It is derived from the UTM
grid system but uses a different labeling
convention. It does not describe a point,
but rather an area.
Mil-radians
The military use mil-radians (short for milli-
radians) because breaking down a circle into
6400 mil-radians rather than 360 degrees
allows greater accuracy.
Nautical mile
Distance corresponding to one minute of arc
of latitude along any meridian, 1852m.
A mile (‘statute mile’) is 1609m.
POI
A Point Of Interest.
Route
A route is shown on the unit as a series of
transparent yellow lines going from waypoint
to waypoint. A route may be pre-planned
either on the unit or on a pc, or it may be a
converted trail (known as a ‘track’).
Satellite
A GPS satellite is a satellite used by the
NAVSTAR (NAVigation Satellite Timing and
Ranging) Global Positioning System (GPS).
The rst satellite in the system, Navstar 1,
was launched February 22, 1978.
SD Card
Secure Digital card (1MB – 4GB). SDHC is
Secure Digital High Capacity (4GB – 32GB),
which has a different internal format. In
the manual these are also referred to as
mapcards since they are pre-loaded with
digital mapping.
Soft keys
Buttons whose functions vary depending on
which screen is displayed.
Target speed
The speed on which Estimated Time of Arrival
calculations are based.
Toggle function
Allows users to select which map they want to
view at a particular point without changing the
zoom level. The map layers you are toggling
between must be of the same area.The map
card must be toggle enabled.
Toggleable maps
Older maps can be converted to enable
toggling and maps are available which are
already toggle enabled. A toggle enabled map
card contains more than one scale or map
type of a particular area.
Track
A track is a trail that has been saved. It
effectively becomes a route.
Trail
The path taken, leaving behind a snail trail.
Trail Up
The map is orientated to match the ground
ahead of you.
Trip Log
Records trip data.
True North
The direction along the earth’s surface
towards the geographic North Pole.
UTC (also GMT and Zulu time)
The worldwide standard for time is
coordinated universal time, abbreviated
UTC. This was formerly known as Greenwich
Mean Time, GMT. UTC is a high precision
atomic time standard also referred to by the
military and civil aviation as Zulu time (Z).
The abbreviation is a compromise between
CUT (Coordinated Universal Time) and TUC
(Temps Universel Coordonné).
UTM
The Universal Transverse Mercator
coordinate system is a grid based method
of specifying locations.
15.00 Glossary
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