Water speed record (fastest boat)

According to Official Guinness Records,

The official world water speed record is 275.97 knots (511.09 km./h, or 317.58 mph) by Ken Warby in the unlimited-class jet-powered hydroplane Spirit of Australia on Blowering Dam Lake, New South Wales, Australia, on 8 October 1978. However, it is estimated that Warby reached an estimated 300 knots (555 km/h., or 344.86 mph) unofficially at the same location on 20 November 1977.

For a complete list of 1977 records, please visit 1977 Guinness Records in Australia.

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