This green channel marker sign from First Sign Corp. can be used to mark odd numbers in channels and other waterways. The square waterway marker is 24” x 24” and made from a heavy-duty .080 aluminum. Created to help boaters navigate through waters, the waterway marker sign is easy to see thanks to its bright green fluorescent background and its reflective green numbers and border. The green port daymark sign, also known as a daybeacon meets all the specifications laid out by the FWC and Coast Guard and can be purchased through First Sign Corp. via special order. Please include the number you need when placing your order.