Did the NAV VSS modification but have a question

[Luv2Camp]

I had read some posts on the web that the GPS would work without the VSS wire as it would use the GPS antenna if the VSS wire was disabled. One post I read stated that although the NAV would work with the VSS wire disabled, the vehicle position on the screen could get "jumpy" and that the VSS wire helped the positioning of the unit based ont he speed of the vehicle and that is why you should not just disconnect the wire. When I did the mod yesterday I was not expecting the tracking to stop completly when the circuit was opened.