The GIUK gap's an area in the northern Atlantic Ocean that forms a naval warfare chokepoint. Its name's an acronym for Greenland, Iceland, and the United Kingdom, the gap being the open ocean between these three landmasses. The term's typically used in relation to military topics. Importance to Royal Navy The GIUK gap's particularly important to the Royal Navy, as any attempt by northern European forces to break into the open Atlantic would've to do so either through the heavily defended English… (More on Giuk)