Sailing-America's Cup viewers get to 'see' wind shifts before crews

BARCELONA : As New Zealand and Britain set out to sea for their latest America's Cup head-to-head, both crews will be scanning the surface for wind shifts to gain an edge in the tricky Mediterranean conditions off Barcelona.

Back ashore, viewers are able to track the breeze on screen thanks to a software developed by one of the America's Cup sponsors to try to attract a wider audience.

This "visualisation of the wind" also links up with a race boat simulator to include a "ghost boat" showing which team is likely to gain an upper hand, giving commentators a crucial advantage over the two teams vying to win the "Auld Mug".

Although their state-of-the-art AC75 boats have every type of electronic gizmo giving them their speed, direction and "flying" height on their foils above the water, the one thing the crews are not allowed on board is live weather data.

The wind "Lidar" system IT company Capgemini has set up in Barcelona uses pulses of light which reflect back off particles in the air, enabling them to calculate speed and direction.

"Each of the Lidars that we've got emits 10,000 pulses per second. We've got three of these machines, so we're effectively pulsing the Barcelona bay with 30,000 beams every second," said Keith Williams, Capgemini's chief engineer for WindSight IQ.

The beams are "completely eye safe", Williams added of the equipment, which he said is often used for planning wind farms or to detect significant wind shear at the end of a runway.

"We're effectively putting just under a quarter of a million wind sensors on the course," Williams, who is a keen sailor, told Reuters, adding that the system uses an algorithm to give an accurate representation of the wind field in real time.

The big question is: are the crews