Here's the demo, it's GDI should work anywhere. Whatelse ... oh it still doesn't swap parent nodes, but I don't think that matters for a cross style movement pattern.
Press the left mouse button to move the tank, press the right mouse button to place a poorly drawn mountain. Be amazed at the tanks path finding abilities.
Oh there's no timing - so the tank will whip from location to location as fast as computerably possible.
Also this is the reason google note book is useful / a good idea.