24 hour distance
The total distance sailed by the boat, measured by GPS (Global Positioning System) in the 24 hour period ended by a poll to the boat. Boats are polled at 0400, 1000, 1800 and 2200 GMT each day.
24 hour speed
The average speed sustained by the boat, measured by GPS (Global Positioning System) in the 24 hour period ended by a poll to the boat. Boats are polled at 0400, 1000, 1800 and 2200 GMT each day.
Max 24 hour distance run
For the leg indicated, the greatest distance run in any polled 24 hour period and the day on which it was achieved.