Becker EDITION TRAFFIC ASSIST PRO 7929 TMC - Manual (Page 32)

32
Navigational mode
Navigational mode What is navigation?
The term "navigation" (lat. navigare = to
travel by sea) is generally understood to
mean the location of a vehicle, the
determination of the direction and
distance from the desired destination
and the required route. Stars, prominent
landmarks, compass and satellites etc.
are used as navigation aids.
With the Traffic Assist Pro, the location
is determined by the GPS receiver. The
Navigational Satellite Timing and
Ranging - Global Positioning System
(NAVSTAR-GPS, usually referred to
as GPS) was developed in the 70s by the
American military for navigation and
location purposes.
GPS operates using signals from
satellites orbiting the globe on a fixed
trajectory. At any one time, there are a
minimum of 24 satellites guaranteeing
constant reception from any point in the
world. The GPS receiver receives these
signals, uses the signal times to calculate
the distance from the individual
satellites and then determines your
current geographical position.
Signals from at least three satellites are
required to determine your position;
your height above sea level can be
calculated if signals are received from
five or more satellites.
The Traffic Assist Pro determines the
direction and distance from the
destination using a navigation computer
and a digital street map on the SD
memory card.
For safety, directions to the designation
are mainly provided verbally. The di-
rection display and map diagram on the
touch screen are further aids. !Safety information
• The road traffic act takes prece-
dence in all circumstances. The na-
vigational system is only an aid.
The data/details provided may in
some cases be incorrect. The driver
must always decide whether to fol-
low the details given or not.
We accept no liability for the navi-
gational system issuing incorrect
details.
• When first started up, it may take
up to 30 minutes before a position
can be determined.
• Precedence should always be given
to actual traffic signs and local traf-
fic rules.
• The directions only relate to cars.
Special recommendations and rules
for other vehicles (e.g. commercial
vehicles) are not taken into consi-
deration.
• Destinations may only be input
when the vehicle is stationary.