Rating system of the Royal Navy

historic system used by the British Admiralty to categorize Royal Navy sailing warships

thumb|Painting of a model of the first-rate HMS Royal George (1756)|HMS Royal George

thumb|Painting of the fourth-rate HMS Woolwich (1675)|HMS Woolwich

thumb|The third-rate HMS Buckingham (1751)|HMS Buckingham on the stocks before its launch in 1751 thumb|Painting of the third-rate HMS Melville (1817)|HMS Melville In the rating system of the Royal Navy, a third-rate was a ship of the line which from the 1720s mounted between 64 and 80 guns, typically built with two gun decks (thus the related term two-decker).

thumb|HMS Liverpool (1758)|HMS Liverpool, a Coventry-class sixth-rate