121 Colregs Midterm Quiz C 70

Sidelights can be seen right ahead to 22.5 degrees abaft the beam. This means that the sidelights are visible in a sector of 22.5 degrees on either side of the ship's heading, starting from directly ahead and extending towards the rear of the ship. This is a true statement as it accurately describes the visibility range of the sidelights.

A 100 meters power driven vessel under way at night must exhibit the forward and aft masthead light. This is because according to the International Regulations for Preventing Collisions at Sea (COLREGS), power-driven vessels of this size are required to display both the forward and aft masthead lights when underway at night. These lights help to indicate the vessel's size, direction of travel, and overall presence to other vessels, ensuring safe navigation and preventing collisions.

The length of the vessel can be determined by the sound of the gong. Typically, the length of a vessel is proportional to the sound it produces. In this case, the gong sound suggests that the vessel is 120 meters long.

A vessel constrained by draft making way is required to display a black cylinder day shape. This day shape indicates to other vessels that the vessel has restricted maneuverability due to its draft and may not be able to easily change its course or speed. It serves as a warning to other vessels to exercise caution and give the constrained vessel enough space to navigate safely.

A vessel of 12 meters or more but less than 20 meters in length is required to have an all round light that is visible at a range of 2 miles. This means that the light on the vessel should be bright enough to be seen from a distance of 2 miles, providing a clear indication of the vessel's presence to other boats or ships in the area.

When a vessel is underway but stopped on the water, it is an indication that the vessel is not moving but still in operation. In this situation, the sound signal of 2 long blasts would be sounded. This signal is used to indicate that the vessel is not underway and is either anchored or aground. It alerts other vessels in the vicinity to be cautious and take appropriate actions to avoid a collision.

In this scenario, the statement is true. A dredger of 150 meters in length is required to sound a gong aft when aground in restricted visibility. This is because in restricted visibility, it is important for vessels to signal their presence and location to avoid collisions. Sounding a gong aft helps other vessels in the vicinity to be aware of the dredger's position and take necessary precautions.

In restricted visibility, such as fog or heavy rain, it is important for vessels to signal their presence to avoid collisions. The interval between sound signals is crucial in ensuring that other vessels can accurately determine the position and distance of the signaling vessel. The correct answer, "not more than 2 minutes," indicates that vessels should sound their signals at intervals of less than or equal to 2 minutes to maintain effective communication and prevent accidents in conditions of restricted visibility.

During periods of reduced visibility, it is important to display navigational lights on your vessel regardless of the time of day. These lights help other vessels to see and identify your boat, reducing the risk of collisions. Even during the day, if visibility is reduced due to fog, rain, or other factors, displaying navigational lights is necessary to ensure the safety of your vessel and others around you.

When a power-driven vessel is underway but stopped on the water in restricted visibility, it should sound 2 long blasts as the appropriate sound signals. This signal alerts other vessels of its presence and indicates that it is not able to maneuver freely due to restricted visibility. The 2 long blasts are a standard signal for a power-driven vessel in this situation, helping to prevent collisions and ensure the safety of all vessels in the area.

If a cone is placed apex upward aft of a fishing vessel engaged in trawling, it indicates that the outlying gear extends more than 150 meters. This is because the cone serves as a visual signal to other vessels, warning them to keep a safe distance to avoid getting tangled in the fishing gear. Therefore, the statement is true.

Both the tug and the tow will display the towing diamond when the tow is more than 200 meters. This is because the towing diamond is a visual signal used to indicate that a vessel is engaged in towing operations. It is displayed on both the towing vessel (tug) and the vessel being towed. By displaying the towing diamond, both vessels communicate to other vessels in the area that they are involved in a towing operation and should be given a wide berth.

The visibility of the masthead light is 6 miles because it is required by maritime regulations for vessels over a certain length to have a masthead light with a visibility range of at least 6 miles. This ensures that the light is visible to other vessels from a safe distance, allowing for proper navigation and collision avoidance at sea.

The characteristic of a yellow light is that it is the same as a stern light.

A mine clearance vessel needs to exhibit an anchor light even when it is on duty at anchor. This is because a mine clearance vessel is involved in dangerous operations and needs to ensure its visibility to other vessels to avoid collisions. The anchor light serves as a signal to other vessels that the mine clearance vessel is present and at anchor, allowing them to take necessary precautions and maintain a safe distance. Therefore, it is necessary for a mine clearance vessel to display an anchor light even when on duty at anchor.

When a vessel is aground, it is required to display the N.U.C. (Not Under Command) lights and anchor lights on specified length. The N.U.C. lights indicate that the vessel is unable to maneuver due to some exceptional circumstances, such as being aground. The anchor lights are displayed to indicate that the vessel is stationary and not underway. Therefore, the statement is true.

When a power-driven vessel is towing another vessel, it must display a yellow light over a white light at the stern. The yellow light indicates that it is a vessel engaged in towing or pushing, while the white light ensures visibility and indicates that it is a power-driven vessel. This combination of lights alerts other vessels of the towing activity and helps them navigate safely around the vessels.

A vessel that emits one long blast followed by four short blasts is identified as a pilot vessel. Pilot vessels are used to guide larger ships through narrow or challenging waterways. The specific sound signal indicates that the vessel is engaged in pilot duties and should be given priority and cooperation by other vessels in the area.

The range of visibility of the side lights for a vessel 8 meters in length is 1 mile. Side lights are navigation lights that indicate the presence and direction of a vessel to other boats. They have a specific range of visibility to ensure safe navigation and prevent collisions at sea. In this case, the side lights of a vessel that is 8 meters long can be seen from a distance of 1 mile.

A vessel engaged in diving operations is required to display the prescribed lights and shape for a vessel of any length. This is necessary to ensure the safety of other vessels in the vicinity and to indicate to them that diving operations are taking place. By displaying the appropriate lights and shape, other vessels can take the necessary precautions and avoid colliding with the diving vessel. Therefore, the statement is true.

In restricted visibility, vessels are advised to avoid altering their course to port. This is because it can increase the risk of collision as other vessels may not be able to see or anticipate the change in direction. However, this rule does not apply to vessels that are being overtaken. In such a situation, the vessel being overtaken is expected to maintain its course and speed, while the overtaking vessel maneuvers safely around it. Therefore, the statement is true.

A vessel of less than 12 meters engaging in diving operations is required to exhibit the lights and shape prescribed in rule 27. This means that it must display the appropriate lights and shapes to indicate to other vessels that it is involved in diving activities. Therefore, the statement is true.

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In a crossing situation, when a sailing vessel is showing a cone apex down, it indicates that it is the stand-on vessel according to the International Regulations for Preventing Collisions at Sea (COLREGS). As the stand-on vessel, the best action to be taken is to maintain course and speed, allowing the other vessel to take the necessary action to avoid a collision. This ensures that both vessels can safely navigate around each other while following the rules of navigation.

A towing yellow light will be carried above a vessel's stern light at anytime when towing. This means that whenever a vessel is engaged in towing another vessel or object, it is required to display a yellow light above its stern light. This helps to indicate to other vessels in the vicinity that the vessel is towing and may have limited maneuverability.

When two vessels are in sight of each other and green lights are visible from each other, it means that both vessels are approaching each other from opposite directions. In this situation, both vessels are considered as give way vessels, which means that they should take action to avoid a collision by giving way to the other vessel. Therefore, the statement is true.

A tugboat without a tow will produce a sound signal of one long blast. This signal is used to indicate that the tugboat is not towing any vessel or object.

Any vessel able to tow exhibits a yellow light with the same characteristics as a stern light in addition to the navigational lights. This means that any vessel that has the capability to tow other vessels will have this specific type of light.

When intending to overtake another vessel on its port side, the correct sound signal is 2 long blasts followed by 1 short blast. This signal indicates to the other vessel that you intend to overtake and pass it on its port side. Therefore, the given answer is false.

The vessel showing a black cone apex up forward of your beam is most likely a vessel engaged in fishing. This is because displaying a black cone apex up is an internationally recognized signal for a fishing vessel.

When a vessel is aground, it is important to distinguish it from an anchored vessel. The additional signal that should be sounded in this situation is three strikes before and after a rapid ringing of the bell. This combination of signals helps to indicate that the vessel is in a precarious position and requires immediate attention or assistance. The rapid ringing of the bell adds urgency to the signal, alerting other vessels to the potential danger.

In a towing vessel, a black diamond is not required to be exhibited if the length of the tow is 150 meters.

A vessel not under command is a vessel that is unable to maneuver as required due to exceptional circumstances. In such a situation, the vessel is required to exhibit two all-round red lights in a vertical line, in addition to the sidelights and sternlight. Therefore, the statement that a vessel not under command shall exhibit a masthead light when she is underway and making way is false.

The appropriate sound signal to be sounded by a sea plane in restricted visibility is not mentioned in the options provided. Therefore, the correct answer is "none of the above".

The vessel engaged in fishing shows the same lights signal when underway or at anchor. This is because fishing vessels are required to display the same lights whether they are actively fishing or not, in order to indicate their presence and avoid collisions with other vessels.

The range of visibility of the stern light on a vessel is typically 2 miles. This means that the light can be seen by other vessels or observers up to a distance of 2 miles away. It is important for the stern light to have a sufficient range of visibility in order to ensure the safety of the vessel and to alert other vessels of its presence in low visibility conditions, such as at night or in foggy weather.

Rule 35 does not apply to the maneuvering signals of vessels in sight of one another. Rule 34 specifically addresses the maneuvering and warning signals that vessels should use when in sight of one another. Therefore, the given statement is false.

A vessel constrained by draft at anchor is required to display a day shape of 1 black ball. This is to indicate to other vessels that the vessel is unable to maneuver freely due to its draft and may require extra space or caution. Displaying the day shape helps to prevent collisions and ensures the safety of the vessel and other vessels in the vicinity.

The given question states that the side lights of the other vessel are visible from your radar position, but it does not provide any information about the length of the vessel. Therefore, the answer is "no specified length" because there is no indication of the approximate length of the vessel based on the given information.

If the vessel is N.U.C. (Not Under Command) underway and making way at night, a total of 5 lights will be visible. These lights include the red and green sidelights, the white masthead light, the white stern light, and an additional white all-round light. The additional white all-round light is required to indicate that the vessel is not under command. Therefore, the correct answer is 5 lights.

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A vessel towing a barge alongside is required to display the same lights as a vessel towing another vessel of its own length. This means that it should display a white masthead light forward, a white stern light aft, and sidelights (red and green) indicating the direction of the towing vessel. These lights help other vessels to identify the towing vessel and take necessary actions to avoid collision.

A pilot vessel when underway is not required to exhibit a white masthead light in addition to the white over red on its mast. The white over red lights indicate that the vessel is a pilot vessel and is engaged in pilot duties. The white masthead light is not necessary in this situation. Therefore, the statement is false.

In dense fog, it is important to maintain course and speed to avoid any sudden changes that may lead to a collision. By maintaining course and speed, the captain can ensure that the vessel's position remains predictable to other vessels, reducing the risk of a collision. Additionally, sounding the danger signal or altering course to port may confuse other vessels and increase the chances of a collision. Therefore, the best course of action is to maintain course and speed.

If you are heading due north and you observe a vessel's green light on your port beam, it means that the vessel is on your left side. Since you are heading north and the vessel's green light is on your left, it implies that the vessel is also heading northward in the same direction as you.

A cone apex downward does not indicate that a fishing vessel is engaged in fishing with outlying gear extend more than 150 meters.

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In a sailing vessel of more than 20 meters, a red over green all around light is not required to be exhibited below the masthead light. The correct answer is False.

According to international regulations, a vessel aground is not required to sound the appropriate signal if it is less than 12 meters in length.

A combined lantern near the top of the mast is the best description for a sailing vessel less than 20 meters. This means that the vessel has a single lantern that combines both the sidelight and the sternlight, and it is positioned near the top of the mast. This configuration is commonly used in smaller sailing vessels to meet the required lighting regulations for navigation and safety at sea.