Diamond Jubilee: 'An honour to skipper'
Boats that are too tall to travel under bridges will be moored at St Katharine Docks and along a mile-long stretch from London Bridge to Wapping known as the Avenue of Sail.
Andy Hall is skipper of the Challenge Wales which is an an ex-Round the World Race boat now operated by the charity Challenge Wales which teaches young people sailing.
Greg Miller is skipper of HMSTV Endeavour, used by the military's Joint Services Adventurous Sail Training Centre. He said it was an honour to skipper in an event like this.