Did some more testing with powerbook and mapmonkey.
GPS works really well but occasionaly the audio (when giving direction) breaks up a little.
VPC sleeps and returns to where it was most of the time. However refuses to acknowledge the gps from time to time. The only 'fix' is to disconnect and reconnect gps. This can be a potential show stopper for me..unless I can find a fix/workaround !!