[shadowflit]

>> Even more practically, the GPS could use the timing information to slip in spoken directions at less distracting moments, like a human companion might.

I really like that idea. Of course, the GPS tends to be a bit of a nag, so it might be hard for it to find enough pauses.

I don't have my GPS integrated with the car, so I can just let the GPS audio compete with the car audio, and adjust GPS volume to mess with the intrusiveness factor. After listening to the original sample... wow that would annoy me a lot.