“There is a lot of free mileage to be gained wherever you are sailing in northwest Europe,” says Tidetech chief executive Penny Haire.

The same goes for voyages through the Malacca or Singapore straits and across large parts of the East China Sea, where working with tides and currents can realise significant marine fuel savings.

Tidetech Commercial Marine is a 10-year-old company based in Hobart, Tasmania, southern Australia, that has gathered together some of the foremost experts in oceanography and is compiling accurate data about the seas for use in computerised navigational systems.