Which Vehicle Nav. System (GPS) is the best for Canada and USA?

Question

Which one is the cheapest and which one has the best value for money?

Answer 1

The Mark I human brain running the standard-issue software, coupled with documentation issued by either AAA or CAA, and augmented by Government-erected local traffic informational displays.

Translation: A roadmap and common sense is the cheapest and easiest to use, especially if you pay attention to the road signs.