Race day ferry service timetables will be customised again for the Prada Cup

Auckland Harbour is going to be busy again from today -- as three challengers fight to meet Team New Zealand in the 36th America's Cup.

The 'race day' timetables for Devonport and Waiheke are the same as those operating during the Christmas Cup in December.

Fullers360 will operate a 45-minute frequency for its Waiheke Island service from 2pm, and Devonport services will operate at a 20-minute frequency -- though there may be delays.

Auckland Transport is also advising Aucklanders to plan their journeys in advance.