A give-way vessel is defined as the vessel that is required to take action to avoid a collision by yielding the right of way to another vessel. This situation often arises in various scenarios, such as when two vessels are approaching each other, and the navigation rules dictate which vessel must alter its course or speed to prevent a collision. Understanding the context of the navigation rules helps clarify that the give-way vessel must be aware of its responsibilities in a meeting, crossing, or overtaking situation. The rules of the road require this vessel to take necessary measures, which can include altering its speed or direction to allow the stand-on vessel — the one that has the right of way — to safely navigate without interference. This concept is essential for safe navigation and mutual respect among vessels on the water, as it facilitates orderly movement and minimizes the risk of accidents. Hence, being informed about which vessel is the give-way vessel is crucial for mariners to avoid hazards and adhere to maritime safety standards.

The catalog for nautical charts serves as the primary source for locating the number of a chart corresponding to a specific geographical area. It contains detailed listings of all available nautical charts, including their titles, scales, and coverage areas. This comprehensive reference guides mariners in identifying the appropriate chart they need for navigation in a particular region. Other resources may contain valuable navigational information, but they do not serve the same purpose for chart identification. The Nautical Almanac focuses on celestial navigation and astronomical data, while the Local Notice to Mariners provides updates and changes regarding maritime navigation but does not include a chart catalog. The US Coast Pilot offers descriptive information about navigation routes, hazards, and points of interest, yet it does not list chart numbers specifically for SAMPLElocations. Therefore, the catalog for nautical charts is the most reliable and directed source for chart numbers.

A sailing vessel under power is required to display a light configuration that is the same as that of a power-driven vessel. This means that when a sailing vessel is using its engine, it must show a masthead light (white light positioned at the top of the mast), sidelights (green on the starboard side and red on the port side), and a stern light (white light at the back). This configuration clearly indicates that the vessel is operating as a power-driven vessel rather than solely under sail. The other configurations mentioned do not accurately represent a sailing vessel that is under power. For instance, only displaying anchor lights would suggest that the vessel is at anchor and not underway. Sidelights alone would not be sufficient to indicate that the vessel is under power, as these lights need to be complemented by the masthead and stern lights for clarity in navigation. Flashing lights are typically reserved for specific types of vessels or signaling situations, but they do not represent a standard configuration for a sailing vessel under power. Thus, the light configuration for a sailing vessel under power must comply with the same requirements as that of a power-driven vessel.

The correct answer is that vessels should sound one prolonged blast when approaching a bend in a narrow channel or when visibility is restricted. This signal serves a critical purpose in maritime safety, particularly in conditions where visibility is limited, such as fog or during nighttime operations. Sounding one prolonged blast is a means of alerting other vessels to your presence and indicates your intention to maneuver within the channel, which is important because it helps prevent collisions. In narrow channels, where visibility can be severely compromised, this sound signal informs other vessels that you are approaching and maintaining your course, providing them with the information necessary to take appropriate action. In contrast, while sounding a blast in fog or when entering a harbor can be relevant, they typically involve a different type of sound signal. Vessels in fog may use a series of blasts as a precautionary measure, while entering a harbor may have specific signals associated with the harbor's own navigation rules. Thus, option B focuses on the correct and clear use of one prolonged blast in specific navigation situations where visibility and maneuverability are compromised.