Since we always travel in out RV with a small laptop computer we have used DeLorme's Street Atlas and Topo proigrams for many years and have been extremely satisfied with their accuracy and convienence. Work great for planning out our route ahead of time and following it in real time as we travel, also lets us keep an archive of all our travels including stops, and even campground site info in case we want to go back to a favorite site.
We usually upgrade every other year and find the roads are usually pretty well up to date. Fortunately you can also add roads yourself if it does need some local update. You can input driving habit such as speed, time between rest stops, type of road to travel, etc. and it will suggest possible rest stops and time/distance to get gas. It also hasa the usual several million POI's.
Highly recommended
