User Guide

Subject to errors or technical changes 58 Copyright by Becker GmbH, D-76303 Karlsbad
Installation Guide
15. Troubleshooting
Troubleshooting for GPS antennas and faulty installation
Fault: Permanent or temporary interference with GPS reception, faulty determination of current position, unit cannot be
calibrated.
The navigation system calculates the current position from the data received by the integrated GPS satellite receiver. Per-
fect GPS reception is very important for the proper functioning of the navigation system. Reception is strongly affected
by the installation position of the antenna.
The antenna should not be installed under metallised windows and should, as far as possible, have a "free view" of the sky.
It is possible to check how many satellites are being received via the GPS info menu. See “Function control of the GPS
antenna (GPS info)” on page 54.
On average, more than 4 satellites should be received. It is not, however, merely the number of satellites which is decisive,
but also the quality of the reception signal. Quality of reception depends on the weather, so that in the case of installations
without sufficient reception potential, trouble-free navigation is possible in good weather conditions, whereas navigation
may not always function faultlessly in poor weather conditions.
This behaviour often occurs when the reception antenna is fitted behind coated windows (e.g. Siglasol or other heat-pro-
tection glazing).
One indicator for poor GPS reception quality is a rapid change in the number of receivable satellites, where these cannot
be accounted for by reception shading (buildings, bridges, trees or tunnels).
Solution: The most favourable installation position possible should be selected. In the case of all-round heat-reducing gla-
zing, an exterior antenna connected via an adapter (optionally available) can be used.