Annapolis emphasizes the standard skills and proven methods that eliminate error and confusion, ensure security in emergencies, and allow every sailor more time for enjoyment on the water. Much has changed on the water since 1983 when this book was originally published. Black buoys are now green, the Global Positioning Satellite navigation system (GPS) is almost universally used, new types of anchors and sails have appeared, safety skills and gear are vastly improved, many more women are commanding boats, and catamarans and trimarans are common where only monohulls used to sail.