[Mister B]

Hi,

greetings to your nice town on a dirty river ;-)

To your problem. It's not normal that your navi losts the position so often but it's
noprmal that it sometime needs a recalibration. But the navi makes the recalibration
on it's own - normaly.
The computer needs two signals. One is coming from the antenna an one from
the ABS-sensors of your brakes.
So please check first all connectors to your navi-computer. To do so, switch off the
ignition, wait untill the LED on the navi-front stops blinking, then remove the
navi from all connectors, including the antenna and clean the contacts. Sometimes
it's useful to spray in some electrical-contact-spray.
Please remember that the blue connector is responsible for the electric power supply.
So the blue connector is the first to remove and the last to connect.
If this little workaroud doesn't help you, you need to clean the ABS-Sensors.
On the attached picture you can see the position of the sensor. (the sensor is
marked with an arrow).

I hope that will help you.

Greetings to Ireland, Dublin and Temple bar

MB