MY NAVMAN MY90XLT MODEL NO 275 MY PIN CODE HAS BEEN CHANGED AND DON'T KNOW IT HOW DO I RESET CODE PLEASE

SOURCE: navman pin 570 navigation not working screen says gps port closed

tap on "GPS Status" (second page of GPS software) and be sure that the box is checked in the upper left hand corner. In the same screen, be sure com 8 and 9600 (baud rate) is shown.

SOURCE: i have a VW Polo

There are several sites that will give you the immobilizer code based on your VIN and there are independent repair shops that have an ABRITES Commander diagnostic program that allows the reading of the PIN directly from the memory of the immobilizer. Since these tools and sites can be used to bypass the security on a car and steal it i cannot give you a direct link - you will have to search for them yourself.
But i can give you the link to this

http://www.autotronics.co.uk/cscart/vw-polo-0002-immobiliser-transponder-recoding-and-replacement-car-key-service-clone.html

SOURCE: navman reset pin

call manufacturer with the serial number they will help you

SOURCE: i don't know the pin!is not 0000,can i reset it?? thx!

0000 is usually the default pin. it ought to work except the default pin has been altered