Made in accordance with FWC and Coast Guard specifications, the green channel marker sign from First Sign Corp. is a square waterway marker that is designed for odd numbers. The green port daymark sign is 36” x 36” and constructed out of .080 aluminum or .125 (Coast Guard Spec )aluminum that is durable in almost all weather conditions. Designed to serve as an aid for boaters as they navigate through waters, the waterway marker sign is covered in a bright green fluorescent material with reflective green numbers and border that will make it easy to spot. The sign is available through First Sign Corp. by special order. Please let us know which number you’ll need on your marker when you place an order.