Here's what I use:
I have a Magellan Trailblazer GPS and the Delorme Street Atlas and Map & Go CD
ROM based software maps.  Unfortunately the Delorme software won't comminicate
with the particular model of GPS that I have.  The software has a number of
drivers to communicate to a variety of GPS units.  Mine's not on the list!
When I've used the software on-line with a GPS, I've borrowed a friend's
Magellan 4000.  Works well!

The Delorme CD maps that I have DO cover Canada, but they appear to be in less
detail that USA.  Perhaps those sold in Canada, have more Canadian detail.

The "Tripmate" kit that Delorme sells is a combination of  their CD ROM map
software and a GPS reciever.  The GPS receiver they supply is not functional
as a stand alone unit however.  It has no dusplay, no buttons, and is usefull
only when connected to a PC with their software.

Street Atlas and Map & Go each cost about $15 to $30 each and both have the
GPS communication capability.  Map & Go adds to Street Atlas hotel, restraunt,
and other attractions from AAA.   GPS recievers run about $100 to $300.  I
suspect the cheapest ones have no communication capability.  Communications
with  GPS receiver is typically an option, and it can be an expensive one at
that!  If you're considering buying a GPS and you expect that you might want
to have it communicate to something (like a PC), find out what it will cost to
add external communications before you buy.

Regards,
Jim Davis