Most of the Royal Family will attend at the highlight of the Trafalgar 200 celebrations, it has been announced.
The Queen will carry out the review on board HMS Endurance
The Queen and senior royals will take part in the massive International Fleet Review at Spithead off Portsmouth.
About 250,000 people and thousands of spectator yachts are expected to gather to watch the inspection of 165 ships on Tuesday June 28.
The Police and Royal Navy have launched a huge security operation to fight the threat of terror attacks at the event.
Minesweepers are already being used to secure the Solent and exclusion zones will be in place around each warship.
Ships and government leaders from 70 nations have been invited to take part in the International Fleet Review.
The Duchess of Cornwall and the Prince of Wales will be among the royals who will witness the Fleet Review from on board a navy ships.
The International Fleet Review, which will involve about 56 Royal Navy ships, 59 foreign warships, 50 merchant ships or tall ships.
It is marking the 200th anniversary of the Battle of Trafalgar in 1805.