
Off-road Navigation
34
NAVIGATION TERMINOLOGY
To check where the following appear on the
display, refer to ’Route Guidance’, earlier in
this section.
Destination Arrow
The destination arrow is the larger of the two
arrows in the compass part of the guidance
displays. The arrow indicates the direction of
the destination or next waypoint, relative to
the current vehicle heading. When the arrow
is pointing straight up (0° ) towards the
heading up icon, the vehicle is on a heading
within ± 15° of the destination or next
waypoint.
The arrow also indicates in which direction
the route is being followed:
•
If the arrow is white, the route is being
followed forwards (i.e. in the order that
the route was programmed).
•
If the arrow is green, the route is either
being followed in reverse, or it has been
decided to back-track to a previous
waypoint.
Co-ordinates (Latitude & Longitude)
Latitude denotes the vehicle position in
degrees (° )-upto90° North (North Pole)
or 90° South (South Pole) - from the
equator.
Longitude denotes the vehicle position in
degrees (° )-upto180° East or 180° West
- from the Prime Meridian (0° ). The Prime
Meridian passes through Greenwich in
England.
Each degree of Latitude or Longitude can be
divided into 60 minutes (60’) and each
minute into 60 seconds (60’’).
When entering a co-ordinate, use the
following format:
N (or S) DD° MM’ SS’’
E (or W) DD° MM’ SS’’
(Where N, S, E and W represent the compass
points, and D, M and S represent Degrees,
Minutes and Seconds respectively.)
Compass
The red compass arrow always points to
True North (to an accuracy of ± 15° ). True
North is the basis from which heading and
bearing readings are calculated.
Heading
The heading is the direction in which the
vehicle is pointing. The navigation computer
and GPS satellite receiver work in
conjunction, to calculate the difference in
degrees (° ) between the vehicle’s direction
and True North - this is the reading shown.
Heading Up Icon
This indicates the direction in which the
direction arrow should be pointing to follow
the shortest route (by distance) to the
destination or next waypoint. The icon will
remain at the top (0° ) of the compass part
of the guidance displays.
Bearing
The bearing is the direction (as the crow
flies) to the destination or next waypoint. The
bearing is calculated in degrees (° ) from
True North.
Altitude
The altitude reading is accurate to within 150
ft (50 m). If a valid reading is not available,
the last known altitude will be shown.