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Boating test topic: look-out, safe speed and avoiding collisions
12 test-style questions with the answer and the exact rule.
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- When determining if a risk of collision exists, what specific observation regarding the approaching vessel's compass bearing indicates that risk is deemed to exist?The compass bearing of the approaching vessel does not appreciably change. The rule states that a lack of appreciable change in the compass bearing is the indicator that a risk of collision exists.33 CFR § 83.07(d): “Such risk shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change.”
- According to the rules for action to avoid collision, how should a vessel operator alter course or speed to ensure the action is effective?Make a large alteration that is readily apparent to the other vessel. The regulation requires alterations to be large enough to be easily seen and advises against making a series of small changes.33 CFR § 83.08(b): “Any alteration of course and/or speed to avoid collision shall, if the circumstances of the case admit, be large enough to be readily apparent to another vessel observing visually or by radar; a succession of small alterations of course and/or speed should be avoided.”
- Which of the following conditions qualifies as 'restricted visibility' for the purpose of applying navigation rules?Fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar causes. The regulation lists weather-related phenomena that reduce visibility as the definition of restricted visibility.33 CFR § 83.03(l): “The term restricted visibility means any condition in which visibility is restricted by fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar causes.”
- If you are operating a vessel less than 20 meters in length in a narrow channel, what is your obligation regarding larger vessels?You shall not impede the passage of a vessel that can safely navigate only within a narrow channel or fairway. Smaller vessels are required to yield space to larger vessels that are restricted to the narrow channel.33 CFR § 83.09(b): “A vessel of less than 20 meters in length or a sailing vessel shall not impede the passage of a vessel that can safely navigate only within a narrow channel or fairway.”
- When using radar to determine the range of vessels or other objects in the vicinity, what additional assessment is specifically mentioned as possible?A more exact assessment of visibility. The regulation states that radar use can allow for a more exact assessment of visibility when determining ranges.33 CFR § 83.06(b): “The more exact assessment of the visibility that may be possible when radar is used to determine the range of vessels or other objects in the vicinity.”
- What is the primary requirement for a vessel operator when using radar to assess collision risk in restricted visibility?Use long-range scanning to obtain early warning of risk of collision. The rule mandates proper radar use, specifically highlighting long-range scanning to gain early warning of potential collisions.33 CFR § 83.07(b): “Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects.”
- Under what condition is a risk of collision deemed to exist even if the compass bearing of an approaching vessel shows an appreciable change?When approaching a very large vessel or a tow. The rule specifies that bearing changes can be misleading and risk may still exist when approaching large vessels, tows, or vessels at close range.33 CFR § 83.07(d): “Such risk may sometimes exist even when an appreciable bearing change is evident, particularly when approaching a very large vessel or a tow or when approaching a vessel at close range.”
- Which environmental factors are listed as considerations when determining if a risk of collision exists?The state of wind, sea, and current, and the proximity of navigational hazards. The rule lists wind, sea, current, and proximity to hazards as specific factors to consider for collision risk.33 CFR § 83.06(a): “The state of wind, sea, and current, and the proximity of navigational hazards;”
- What is the required action for every vessel when navigating in restricted visibility regarding speed?Proceed at a safe speed adapted to the prevailing circumstances and conditions. The rule mandates that speed must be adjusted to match the specific visibility conditions rather than fixed limits.33 CFR § 83.19(b): “Every vessel shall proceed at a safe speed adapted to the prevailing circumstances and conditions of restricted visibility.”
- If necessary to avoid collision or allow more time to assess a situation, what is the prescribed action regarding speed?Slacken speed or take all way off by stopping or reversing her means of propulsion. The rule specifies slowing down or stopping/reversing to create time and space for safe assessment.33 CFR § 83.08(e): “If necessary to avoid collision or allow more time to assess the situation, a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion.”
- What is the required nature of any action taken to avoid collision according to the rules?It must be positive, made in ample time, and with due regard to good seamanship. The rule mandates that collision avoidance actions be positive, timely, and demonstrate good seamanship.33 CFR § 83.08(a): “Any action taken to avoid collision shall be taken in accordance with the Rules of this subpart (Rules 4-19) (§§ 83.04 through 83.19) and shall, if the circumstances of the case admit, be positive, made in ample time and with due regard to the observance of good seamanship.”
- What is the obligation of a vessel required not to impede the passage of another vessel when approaching so as to involve risk of collision?The vessel must take early action to allow sufficient sea room for the safe passage of the other vessel. Even when risk of collision exists, the impeding vessel must still take early action to ensure sufficient room for the other vessel's safe passage.33 CFR § 83.08(f): “A vessel which, by any of these Rules, is required not to impede the passage or safe passage of another vessel shall, when required by the circumstances of the case, take early action to allow sufficient sea room for the safe passage of the other vessel.”