Question 41 ONC03 - Master LT 500-1600 GRT

The Correct Answer is A. **Explanation for why option A ("The vessel's searchlight") is correct:** According to the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Annex IV (Distress Signals) and Rule 36 (Signals to Attract Attention), any light or sound signal, other than those specified elsewhere in the Rules, can be used to attract the attention of another vessel, provided it cannot be mistaken for a navigational mark or distress signal. The rapid movement or flashing of a vessel's searchlight is a recognized, non-distress method under COLREGs Rule 36 used to attract attention, such as alerting another vessel to a dangerous close-quarters situation or ensuring they are aware of your presence. **Explanation for why each of the other options is incorrect:** * **B) A red star shell:** This is explicitly listed in Annex IV of the COLREGs as a distress signal. Using it to merely attract attention (non-distress) is prohibited because it signals imminent danger and the need for assistance. * **C) A burning barrel:** This is also listed in Annex IV of the COLREGs as a signal indicating distress and the need for assistance (a light shown on board, such as a burning tar barrel, oil barrel, etc.). * **D) An orange smoke signal:** This is explicitly listed in Annex IV of the COLREGs as a distress signal (a smoke signal producing orange-coloured smoke).