About 40 boats took part in a sail-past and the Bishop of Portsmouth, the Rt Rev Christopher Foster, led the rededication of the station and its crew.
The vice-chairman of the RNLI, Stuart Popham, who is a Hayling resident, marked the occasion with a certificate on vellum.
He said: ‘As a local resident, a sailor, and the vice-chairman, it was a real honour to present the vellum recognising 100 years of life-saving service by so many dedicated Hayling Island volunteers.’
A 17th century cannon from the Fort Cumberland Guard re-enactment group set the sail-past into action.
In the past century the Hayling lifeboat has been launched 2,762 times and rescued 1,802 people of whom 543 were lives saved.