i made two trips to Toronto in '07. both times the factory nav was practically useless. it's really funny when you're on a one-way street and it tells you to go 200 yards and make a U-turn...which would end up putting you in the lake.

i have also "tested" the nav locally by letting it run while i go to places i know how to get to...a couple times i found myself driving in circles.

so, in my experience...the factory nav sucks.