Just an FYI:

I have a BMW navigation system that prior to 9/11 was EXTREMELY accurate and some time after became less so..

I have the destinct feeling that the GPS improvements have been 'backed out' and the accuracy has dropped back to the 10m-50m range..

Also, there's no comparison between a REAL car GPS system and a laptop one.. Mine's hooked into the steering wheel and the ABS sensors.. Neverlost isnt bad, but its rather weak in comparison to the integrated systems.