Oh, boy. Nokia might have hell to pay for putting the N900 on that ad. You see, "navigation" to the Average Joe/Jane would consist of requirements like this:

• The Nokia N900 shall contain navigation aid software.
• The navigation aid software shall be entitled "Ovi Maps."

We then break down the requirements into sub-requirements:

• Ovi Maps shall calculate route information to direct the user to his/her selected destination.
• Ovi Maps shall recalculate route information upon a deviation from the route.
• Ovi Maps shall provide visual cues to remind the user of upcoming directions.
• Ovi Maps hall provide audio cues to remind the user of upcoming directions.

To anybody with an actual requirements engineering background, that list is actually vague, but you get the essence. Also, these people are not going to be as forgiving as some of us here are when the "requirements" I listed are not satisfied. I would not be surprised if someone gets angry enough to lawyer up. The minimum consequence, though, is that Nokia loses another customer.