
Navy rum is a dark, full-bodied overproof rum style rooted in the British Royal Navy's rum ration, traditionally blended from British Caribbean territories like Guyana, Barbados and Trinidad.
Rich and aromatic, with deep molasses, dried fruit and treacle notes; the palate is heavy, not very sweet, and strongly warming thanks to its high strength.
Used as a base measure or a bold float where its strength and dark, layered weight need to come through in the glass; add it sparingly as a modifier, since its overproof backbone can easily dominate a build. It pairs well with citrus, ginger and other bold, spiced flavours strong enough to stand up to it.
As the base spirit it's hard to replace properly; for a float or small modifier, another overproof dark rum is the closest stand-in, though the multi-origin blend character won't be exactly matched. Standard-strength or light rum lacks the body and kick, so it won't work as a substitute.
Overproof rum
Overproof rum is any rum bottled above roughly 50% ABV, including light pot-still rums at 63%; navy rum is specifically a dark, blended British-Caribbean style, historically tied to naval issuing strength.
Dark/blended aged rum
Navy rum is a specific historic style from British Caribbean territories at elevated strength; generic dark rum is just a colour category with no strength convention or naval heritage.
The style comes from the British Royal Navy's rum ration: rum became the official ration spirit around 1806, and the daily tot continued until it was abolished on "Black Tot Day" in 1970.