SOUND SIGNALS IN RESTRICTED VISIBILITY

Figure 9-26.Vessels engaged in dredging or underwater operations: (A) making way; (B) not making way - 14244_185

Figure 9-28.Pushing ahead or towing alongside: (A) International and (B) Inland - 14244_187

Signalman 3 & 2 - Aviation theories and other practices
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Vessel Aground The light display for a vessel aground (fig. 9-27) is RED-RED displayed vertically and the normal anchor lights for a vessel of her length. The dayshape display is three black balls displayed vertically. Rule 30 applies here. Pushing Ahead or Alongside The International and Inland Rules differ when it comes to pushing (fig. 9-28). The international display is two masthead towing lights, sidelights, and a sternlight. The inland display is two masthead lights, sidelights, and a yellow-over-yellow sternlight. Rule 24 applies here. NOTE When the pushing vessel and the vessel being pushed are connected into a composite unit, they are regarded as a power-driven vessel and must exhibit the lights for that class of vessel. Draft A vessel constrained by draft (fig. 9-29) is required to display the following lights: normal light for a power-driven vessel and three red lights displayed vertically. The required dayshape is a cylinder. Draft display is for International use only. Rule 28 applies here. Conclusion As you can see, there are numerous lights and dayshapes to be displayed. For more detailed information, see Navigation Rules, International— Inland, COMDTINST M16672.2B. NOTE When you are using lights and dayshapes, remember that they should always be dis- played where best seen. SOUND SIGNALS IN RESTRICTED VISIBILITY Restricted visibility is defined as anything that reduces visibility below the range that a vessel would normally be visible. It can be caused by rain, fog, smoke, hail, snow, or any other condition that reduces visibility. Rules to remember during restricted visibility are the following: The vessel must proceed at SAFE speed. Safe speed is determined by factors such as state of visibility; the maneuverability of the vessel; the state of the wind, sea, and current; the proximity of navigation hazards; draft in relation to the available depth of water; the traffic density, including the concentration of fishing vessels; and the characteristics and capabilities of radar, if installed. Power-driven vessels must have their engines ready for immediate maneuver. Figure 9-27.—Vessel aground. 9-28

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