Navilight 360 degrees All-Around Tricolor Light 2NM with Scotty Mounting Attachment. Navilight Tricolor Scotty 2NM US Coast Guard approved for 2 nautical miles is fully compatible with the Scotty Deck Mounting system and includes a green light to be shown at the starboard side and a red light to be shown at the port side. In addition, it includes the white Sternlight, to be used at the stern. It is battery operated, uses super bright LED light, is water proof and floats. The green as well as the red lights show an unbroken light over an arc of the horizon of 112,5 degrees. The white Sternlight shows an unbroken light over an arc of the horizon of 135 degrees. All lights work independently, in a combination of all three or red/green together. Examples of usage, based on the Convention on the International Regulations for Preventing Collisions at Sea, commonly called 72 COLREGs. On a power-driven vessel of 12 meters or more in length but less than 50 meters in length As green or r Navilight Tricolor Scotty 2NM US Coast Guard approved for 2 nautical miles is fully compatible wit Examples of usage, based on the Convention on the International Regulations for Preventing Collision As green or red sidelight. As sternlight On a power-driven vessel of less than 12 meters in length . As green or red sidelight As combined green/red As sternlight On a sailing vessel underway