Tracking in the game engine

G'day.

I am trying to achieve the following in a blender game.

I have a little tank with a cannon mounted on a turret on top. I 
want the cannon to aim at an independent object regardless of what 
the tank does.

If I parent the cannon to the tank it will track ok if the tank 
moves (forwards backwards) but if I rotate the tank the turret 
inherits the tanks rotation. It adds the tanks rotation to the 
tracking rotation and the cannon goes well off track.

Is there some way (like powertrack) to remove the parents rotation 
from the child in the Blender game engine.

Any help would be much appreciated.

Thanks and kind regards

Rutger






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