Nav System in Canada

Can someone tell me how the map coverage is for Canada?
Is the Nav System based on the same system as Map Quest?
Thanks

It is not map quest based, or google maps, or yahoo maps. They all have roads that the nav dvd is missing.

I have the 2004 DVD. It is missing many roads in Ontario and Quebec. These are highways that have existed for many years, and are on paper road-maps I have from 15 years ago. One example I found a couple of weeks ago was 15km north of Montreal, on a 6 lane highway going to Tremblant, the nav indicated I was in the middle of no-where. This is not the nav losing the signal, just a poor map. The nav didn't indicate I was on a highway again until I was about 15km from Ottawa-Hull.

Having said that, I find nav very useful for finding your way around big cities that you are not familiar with. I would buy nav again, I just wish the map included all the roads that exist.

After saying that Nav is for Sissies to my sister and wife, I promptly got the lot of us lost west of Toronto two weeks ago.

When I got home I surprised my wife and told her that I had retrofitted her X5 with an aftermarket Nav. To her surprise it was a 5 dollar compass stuck under her mirror (from Canadian Tire). I'll buy a map next trip.