Using the forecast currents you can trial different swimming directions to see which direction will give you the best time.

Click anywhere on the map to start.

Input your estimated swim time and start time and then select a swim direction.

Hourly markers indicate how the forecast currents will affect your swim.

Click on any marker to change your swim direction again until you end up at Rottnest. The revised swim time shows you how much time your choice of direction could save or cost you.

You can scroll through time to see how the current is expected to change through the course of the race.