Grand Admiral a naval rank in one of the highest in the several European navies that use this system, what system are they using?
Grand admiral Grand admiral is a historic naval rank, the highest rank in the several European navies that used it. It is best known for its use in Germany as "Großadmiral". A comparable rank in other navies is that of fleet admiral.
Lieutenant of the Admiralty The Lieutenant of the Admiralty is a now honorary office generally held by a senior retired Royal Navy admiral. He is the official deputy to the Lord High Admiral, an office vested in Prince Philip, Duke of Edinburgh since 2011. He is appointed by the Sovereign on the nomination of the First Sea Lord.