User's Manual

NAVI 139
Off-road navigation
Off-road navigation allows you to navigate in non-
digitized areas (no digital map data available for
this area on the hard drive).
 Observe the applicable regulations in the
country in which you are driving. Driving a
vehicle off official roads is not permissible in
all countries.
Off-road navigation is generally performed only
with the aid of direction arrows and simple
navigation announcements. Even when you are
driving on a road available in the digital map data
on the hard drive, route guidance is via direction
arrows only.
Off-road navigation works best when the vehicle is
located at a significant distance (> 330 feet) from
the digitized road network.
Display during off-road navigation
The following information is displayed during an
active off-road navigation session:
– A compass display with a vehicle symbol in the
center of the compass rose.
– The direction to the next landmark (stopover)
symbolized by an orange-colored direction
arrow.
– The directional deviation from the ideal route,
symbolized by an orange-colored segment.
– The distance as the crow flies to the next
landmark (stopover).
Arrival time during off-road navigation
During off-road navigation, the arrival time
displayed in the e menu among others is
calculated based on an assumed average speed
of approx. 22 mph.
Determination of the vehicle position during
off-road navigation
The vehicle position is determined with the aid of
a GPS antenna and a receiver in the navigation
module. GPS stands for Global Positioning
System and is a satellite-assisted position
tracking system.
Further vehicle signals (e.g. speed) are evaluated
and processed in the navigation computer to
calculate the vehicle position.
This enables the system to automatically correct
signal changes due to wheel changes (altered tire
diameter), temperature, or air pressure variations.
Activating/deactivating off-road
navigation
1. Press the f button.
2. Press the i button or touch the tab of
the same name in the header.
3. Select "
SET NAVI".
4. Select "
Off-Road" to activate ( ) or deactivate
( ) the function.
Off-road navigation is automatically activated after
route guidance is started to a destination in a non-
digitized area.