These markings show you where you are. The second type of diamond daymark is called a crossing daymark and is found on the western rivers and other navigable rivers. Many atons are lighted. Lighted atons can be simple battery-powered minor lights or a tall lighthouses with powerful lights. For example, they may mark the mouth of a channel.
Minor lights are red, green, or white.
Minor lights may also have daymarks. Informational and regulatory marks may be either buoys or rectangular daymarks with orange borders. They are white cylinders. Each buoy has an orange band near its top and a second orange band just above the waterline. They may be can or nun buoys, diamond daymarks, or floating structures.