Used Old Monk rum (the closest thing we can get to Navy Rum where I am living), and it is really good cold! The sweetness and richness of the honey, plus the complexity of the bitters begin. A tinge of citrus follows, with the rum rounding it out. I wonder how it would be with real Navy style rum...
Different from the other rum grog. Not sweet or tiki, but very flavourful. We used a Smith and Cross overproof Jamaican Navy Rum. Went perfectly together. Great for National/International Rum Day.