"Spithead Anchorage: Ships and Vessels of Captain Aubrey's Navy".Several of Jack Aubrey's ships are gathered at Spithead, just off Portsmouth, England.
"Square meal" - British war ships in the 1700s including the HMS Victory (pictured) did not have the best of living conditions. A sailors breakfast and lunch were sparse meals consisting of little more than bread and a beverage. But the third meal of the day included meat and was served on a square tray. Eating a substantial meal onboard a ship required a tray to carry it all. Hence a "square meal" was the most substantial meal served.