Technical data

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Glossary
GMT
(Greenwich Mean Time)
Central European time
Standard time at degree of longitude 0
(the degree of longitude through Green-
wich, Great Britain). This time is used all
over the world as the standard time for
synchronising data acquisition.
GPS
(Global Positioning System)
GPS uses satellites to calculate your cur-
rent geographical position. It is based on a
total of 24 satellites orbiting the Earth and
emitting signals. A GPS receiver receives
these signals and uses the signal time dif-
ferences to calculate the distance to an in-
dividual satellite and thus the current geo-
graphical position (longitude and
latitude). Signals from at least three satel-
lites are required for positioning. The cur-
rent height can also be calculated if signals
are received from four or more satellites.
SD card
(Secure Digital)
The SD card was developed in 2001 by
SanDisk and is based on the older MMC
standard. An SD card is a rewriteable re-
movable memory card.
TMC
(Traffic Message Channel)
Traffic announcements transmitted by
most FM stations via RDS. Basis for dy-
namic navigation.
USB
(Universal Serial Bus)
The Universal Serial Bus (USB) is a bus
system for connecting a computer to ex-
ternal USB peripherals for exchanging da-
ta.
There are two different standards with
various transmission speeds. USB 1.1
transfers at a speed of 12 Mbit/s and USB
2.0 transfers at 480 Mbit/s.
For a transfer of large amounts of data de-
vices that use the USB 2.0 standard
should be used.