Crazy boat racing... Australian?

[sikryd]

Has anyone ever seen boat racing where it looks like ditches were dug out of the ground and filled with water. The boats are small with large engines and damn fast with a driver and a navagator, the navigator has his hand in front of the drivers face and uses it to show the driver which way to turn (left turn, right turn, hard left, 180*, etc...). The boats look like they are making 90*turns at about 80 miles an hour. For some reason I think its Australian, cause Ausies are crazy like that.
Can someone please tell me what this crazy boat racing is called, and tell me where I can get some videos on-line.