[Apofis]

Umm... Google maps has a compass... which rotates with you as you turn. Just look at your icon on the map, at has an arrow facing the direction you are.

[bigiain]

Well, no. Some devices have a compass in them, and Google Maps uses it if possible.

If your device has no inbuilt compass (think iPhone 3G, from memory), there's nothing Google Maps can do about it.

[Apofis]

Oh, my bad. I actually thought it was a feature of the GPS, not a separate sensor.

[chrisfarms]

To be fair, that does require your device has a compass-sensor.