RE: GPS capabilities and limitations
Keep in mind that although the base maps and POI files contain very generic
data the way they are handled and presented can be different from Garmin to
Pioneer to Magellan to Tom Tom.  Most are using data from the same vendor,
Navteq.  Even the main menus appear the same from model to model BUT what
capability is made available to the user varies dramatically from model to
model, even within the same product line.  So determine what your needs and
expectations are for use in your Vanagon, try to check the units out 'hands
on' and be prepared to find that some function that you consider basic just
isn't there because some software designer somewhere  decided 'no one will
ever need to do that'.