Warning Area

Special use airspace identified by the letter "W" followed by a number, extending from 3 nautical miles outward from the coast of the United States over international waters. Warning areas contain hazardous activity similar to restricted areas, such as military training exercises, but because they are over international waters, the U.S. government cannot legally restrict flight there. Pilots operating in warning areas should exercise extreme caution and contact the controlling agency for activity status before entry.