Just wanted to promote my new GPS.  On my most recent adventure I tried to
navigate with my handheld  GPS unit and this was absolutely inadequate while
driving.  I ended up buying a Garmin USB GPS-18.  It comes with up-to-date
software and a small receiver that has a magnetic or suction base.  I put it
in the Westy this past weekend and travelled about 300 miles.  It hooks to
my laptop and I was totally amazed at what I got.  Besides full screen
mapping of my route it has audio prompts.  If you change course the software
recognizes it and modifies your route to your destination.  All of this for
about $100.00 (software alone goes for more than that on the Garmin site). 
I bought it at buydig.com.  I have no connections to them and only wanted to
share something that works great in the Westy.

Larry