Question 16 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is C 1. **Why option C ("navigating in or near an area of restricted visibility") is correct:** The rules governing the conduct of vessels in restricted visibility are defined in Part B, Section III (Rules 19) of the International Regulations for Preventing Collisions at Sea (COLREGs), which apply both internationally and inland (as the Inland Rules generally mirror or incorporate these standards). Rule 19 states that it applies to vessels "navigating in or near an area of restricted visibility." This means a vessel must follow the requirements (such as safe speed, immediate action upon hearing a fog signal forward of the beam, and sounding appropriate signals) not only when they are *in* the fog/heavy rain/snow but also when they are *approaching* it (near an area). 2. **Why option A ("only if they have operational radar") is incorrect:** While vessels with operational radar have specific duties regarding the use of the equipment and mandatory action if radar indicates a close-quarters situation, the basic rules for restricted visibility (safe speed, fog signals, etc.) apply to **all** vessels, regardless of whether they have radar. 3. **Why option B ("in sight of one another in fog") is incorrect:** If vessels are "in sight of one another," they transition from the restricted visibility rules (Rule 19) back to the rules for vessels in sight of one another (Rules 12-18, the standard steering and sailing rules). Restricted visibility rules apply when visibility is compromised and the vessels are *not* in sight of one another. 4. **Why option D ("only if they are showing special purpose lights") is incorrect:** Special purpose lights (such as lights for towing, dredging, or fishing) indicate a vessel's status or operational constraint, but they have no bearing on whether the vessel must adhere to the rules for restricted visibility. All vessels (power-driven, sailing, fishing, etc.) must follow Rule 19 when navigating in or near restricted visibility.