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The State Gun carriage will set off at 10.44am, drawn by 98 Royal Navy sailors known as the Sovereign's Guard who will pull on ropes attached to the carriage's front wheels.
Up to 1,500 sailors will be involved in the state funeral, which will include representatives from all three armed forces.
During rehearsals at HMS Collingwood in Fareham, Hampshire, planners and parade staff spoke of their pride at being chosen to take part in the Queen's funeral.
The monarch's children and members of the Royal Family will then walk behind the Queen's coffin to Wellington Arch when it leaves Westminster Abbey.