USCG Navigation Rules and Regulations
| Latest Update | 2024/2025 | Graded A+
What is the primary purpose of the Navigation Rules as established by the USCG?
The primary purpose of the Navigation Rules is to prevent collisions at sea by establishing
rules for vessel conduct, right of way, and...
What is the primary purpose of the Navigation Rules as established by the USCG?
✔✔The primary purpose of the Navigation Rules is to prevent collisions at sea by establishing
rules for vessel conduct, right of way, and responsibilities between different types of vessels.
When must a vessel use sound signals in restricted visibility?
✔✔Vessels must use sound signals when operating in or near areas of restricted visibility, such
as fog, mist, or heavy rain, to indicate their presence and movements to other vessels.
What is the meaning of a vessel displaying three all-round green lights in a vertical line?
✔✔A vessel displaying three all-round green lights in a vertical line is indicating it is engaged in
mine clearance operations.
When should a lookout be maintained on a vessel?
✔✔A lookout must be maintained at all times when a vessel is underway or at anchor, by sight
and hearing, to ensure the safety of the vessel and to avoid potential hazards.
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,What are the actions required when two power-driven vessels are meeting head-on?
✔✔When two power-driven vessels are meeting head-on, each vessel must alter its course to
starboard to pass safely on the port side of the other vessel.
What does a single prolonged blast from a vessel in restricted visibility mean?
✔✔A single prolonged blast from a vessel in restricted visibility indicates that the vessel is
underway and making way through the water.
What is the required action when a vessel is overtaking another vessel?
✔✔The overtaking vessel must keep out of the way of the vessel being overtaken and pass with
sufficient clearance to avoid collision.
How are vessels expected to behave in a narrow channel or fairway?
✔✔In a narrow channel or fairway, vessels must keep as close as practicable to the outer limit of
the channel on their starboard side to avoid impeding other vessels.
When do navigation lights need to be displayed on vessels?
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,✔✔Navigation lights must be displayed from sunset to sunrise, during periods of restricted
visibility, and in other conditions when visibility is reduced to ensure other vessels can detect
and identify them.
What is the significance of a vessel sounding five or more short and rapid blasts?
✔✔Five or more short and rapid blasts are used as a danger signal, indicating that the vessel
sounding the signal is unsure of the intentions of another vessel or perceives an immediate
danger of collision.
What does "safe speed" mean in the context of the Navigation Rules?
✔✔Safe speed refers to a speed that allows a vessel to take proper and effective action to avoid
collision and to be stopped within a distance appropriate to the prevailing conditions, including
visibility and traffic.
What are the navigation rules for a sailing vessel overtaking a power-driven vessel?
✔✔A sailing vessel overtaking any other vessel, whether power-driven or another sailing vessel,
must keep out of the way of the vessel being overtaken.
What lights must be shown by a power-driven vessel underway at night?
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, ✔✔A power-driven vessel underway at night must display a masthead light forward, sidelights
(red for port and green for starboard), and a sternlight.
When is a vessel required to exhibit an all-round white light?
✔✔A vessel at anchor is required to exhibit an all-round white light where it can best be seen
unless the vessel is less than 7 meters in length and not anchored in or near a narrow channel or
fairway.
What is the obligation of a vessel constrained by its draft?
✔✔A vessel constrained by its draft must show the prescribed lights or shapes indicating its
status and take every possible precaution to avoid risks, given its limited maneuverability due to
the depth of the water.
Vessel (R3) ✔✔Every description of water craft, including nondisplacement craft, WIG craft and
seaplanes, used or capable of being used as a means of transportation on water.
Power-driven vessel (R3) ✔✔Any vessel propelled by machinery.
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