A sailor who became the first person to sail solo non-stop round the world aims for a similar feat 37 years later.
Knox-Johnston sailed into record books on 22 April 1969
Sir Robin Knox-Johnston, from Ipplepen in Devon, made history in 1969 when he completed the journey in 312 days.
The 67-year-old now hopes to lap the planet again in the Velux 5 Oceans, a solo race starting and finishing in Bilbao and split into three legs.
Sir Robin is attending a ceremony at Portsmouth's Gunwharf Quays on Friday to officially name his yacht.
He is the oldest competitor in the race, which was established as the first single-handed round-the-world yacht race in 1982 and is run every four years.
It begins on 22 October and covers three gruelling legs from Bilbao to Fremantle, Australia, and on to Norfolk, US, before returning to Bilbao.
He hopes to finish in 112 days in his Open 60 yacht which is named Saga Insurance.
A Velux 5 Oceans race spokesman said: "Along the way sailors may face huge storms, waves of up to 25 metres, sleep deprivation and extreme isolation.
"Fewer people have achieved this goal than have climbed Mount Everest."
Sir Robin said: "I am looking forward to taking on this challenge, demonstrating once again that age and experience can win out."
He sailed into the record books in 1969 when he won The Sunday Times Golden Globe Race in his 32ft wooden yacht Suhaili.