> Worse, often it'll be the case that the instructions are given late enough that if you wait to consider or second-guess them, you'll miss the turn. Also, it

> Worse, often it'll be the case that the instructions are given late enough that if you wait to consider or second-guess them, you'll miss the turn. Also, it will often recalculate with the assumption that you can immediately follow its directions, even though by the time it's finished saying them you're already past the next turn (and then the next, and then the next...).