Chapter 12- Boating, Diving and Seamanship Boating, Diving, and Seamanship 265 3. Overtaking or Passing: Any boat that is being overtaken, or passed from astern, is also called the “stand on” vessel. If your power boat is being overtaken by a sailboat, you are the stand on vessel and have right of way. The stand on vessel is obligated to maintain course and speed. You must give way to any vessel you are overtaking until all danger or risk of collision is past. 4. Day Shapes and Signal Lights: For what boats should you watch out and keep well clear of? As mentioned, certain boats due to the nature of their work are given the right of way. Such vessels will display day shapes during daylight hours and signal lights at night. There is a chain of consideration or privilege, or “pecking order,” for who is first, second, third, and so on (see figure 12-8). You must stay well clear of those above you in this chain of command. Dive boats will fall into categories two and six. Chain of Command Which boats fall where in the chain of command, and what day shapes and signal lights will they display? Memory phrases for the signal lights will assist you in remembering these lights. Day shapes and signal lights are displayed on the mast. Not Under Command The night signal is two all-round red-over-red lights in a vertical line where they are best seen. Memory phrase: “Red over red. Should’ve stayed in bed.” The day shape is two black balls in a vertical line. These vessels are normally broken down in some capacity. They often have steering and/or engine difficulties and cannot maneuver easily. Restricted In Maneuverability All-round red-white-red lights in a line. Memory phrase: “Restricted with reason.” During the day, ball-diamond-ball shape sequence. These vessels cannot maneuver easily due to the nature of their work. They include dive boats or underwater operations (laying cable or pipe), aircraft carriers (launching or landing only), mine sweepers, and buoy tenders. If a tug boat is pulling a tow, it will also display a day shape and two or three white signal lights, but only if maneuvering with difficulty or if the tow is greater than 200 m (650 ft) astern. Deep-Drafted Vessels The night signal is three all-round red lights in a vertical line. “Rudder rubbing rocks” is the memory phrase. It is unlikely you will encounter a super tanker displaying a black cylinder day shape (optional) or three red lights. If you do encounter one, you will quickly understand its right of way because of the enormous size. Deep-drafted vessels displaying day shapes and signal lights can barely maneuver in the confines of a narrow FIGURE 12-7. BUOYS AND DAYMARKS channel due to their size and draft.
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