Coast Guard is a small port authority boat from Bigg City Port.
The coast guard often stands at the entrance to the estuary of Celgreb Bay ready to question and check incoming shipping before clearance. When he's not doing that, he inspects large-scale operations, such as demolition and quarry work. He may be a small tugboat but his position as a sort of police force on the waters means he shows a strong authoritarian personality towards boats of all shapes and sizes.
The coast guard is not based on a specific prototype although there are several boats like him used for the exact same purpose as he.
Coast Guard is white all over with black lettering and a dark blue strap on his cap.