Gordonstoun pupils are a third of the way through an 80-day voyage around Britain to celebrate 80 years of learning at the school.
Over 80 students aged between 13 and 18 are taking part in the summer trip as crew members of the 80ft Ocean Spirit yacht, which has been berthed in St Katharine Docks in London for the past week.
Traffic in the capital was brought to a halt yesterday when the yacht passed through Tower Bridge.
The vessel will dock at nine ports along the way and current and former students and their families will be invited on board to celebrate the anniversary.
One special guest was the Princess Royal, the warden at Gordonstoun, who attended an 80th anniversary reception last Wednesday.
Ian Lerner, the school’s sail training coordinator, said: “As part of the Gordonstoun curriculum, all students participate and learn valuable life skills such as teamwork and determination.
“The pupils have worked extremely hard to not only prepare the boat but act as hostesses and gain experience entertaining.
“So far, the trip has been quite calm, although it was hard work going around the north of Scotland.
“Every summer we have an adventure on Ocean Spirit, whether that be sailing to the Arctic or taking part in a tall ships race.
“But this year is obviously extra special.”
Simon Reid, principal at Gordonstoun, said: “Gordonstoun, from its foundation in 1934, has always believed that academics alone are not enough for success in life and that valuable lessons can be learnt on the water.
“Sail Training has been part of our curriculum since the earliest days because of the amount that students learn about teamwork, self-awareness and leadership.”
The yacht will sail on to Brighton, Portsmouth, Salcombe, Bristol, Liverpool and Glasgow, having already called at Edinburgh and Ipswich on her way south.