Illustration of midchannel, lighted channel buoy
Illustration of international divers down/alfa flag
Illustration of a traditional Hawaiian double-hulled canoe (wa'a kaulua)
Illustration of interstate highway sign
Illustration of interstate highway sign
Illustration of interstate highway sign
Illustration of interstate highway sign
Illustration of international port lateral marker
Illustration of international starboard lateral marker
Illustration of port lateral marker in United States
Illustration of safe to swim between flags lifeguard flag in Australia
Illustration of danger no swimming lifeguard flag in United Kingdom
Illustration of no inflatables lifeguard flag for United Kingdom
Illustration of surf craft only lifeguard flag for United Kingdom
Illustration of swim in designated areas lifeguard flag for United Kingdom
An icon symbol of a buoy marking the boundary of a marine protected area