Question 43 ONC06 - Master LT 100 GRT

The Correct Answer is A **Explanation of Option A (Correct):** The International Regulations for Preventing Collisions at Sea (COLREGs), Rule 33 (Equipment for Sound Signals), specifies the requirements for sound signaling devices. While power-operated equipment (such as whistles and bells controlled electronically or automatically) is permitted, the regulations mandate that the primary means of sound production must remain functional regardless of power availability. For vessels required to carry a bell and/or gong (i.e., vessels 100 meters or more in length must carry both, and vessels 50 meters or more must carry a bell), Rule 33 states that these devices must be capable of being sounded manually. This ensures that a vessel can always produce the required signals (such as those used in restricted visibility) even if the ship's power or automatic systems fail. **Explanation of Other Options (Incorrect):** * **B) A vessel of less than 12 meters in length need not have any sound signaling equipment.** This is incorrect. COLREGs Rule 33(c) states that a vessel of less than 12 meters in length is not obliged to comply with the general requirements for fitting a whistle and bell/gong, but "if she does not, she shall be provided with some other means of making an efficient sound signal." Therefore, some form of sound signaling equipment (such as a horn or whistle) is required for all vessels, regardless of size. * **C) Any vessel over 12 meters in length must be provided with a gong.** This is incorrect. The requirement for carrying a gong only applies to vessels 100 meters or more in length (Rule 33(b)). Vessels between 12 meters and 100 meters must be provided with a whistle and a bell (if 20 meters or more, or if 50 meters or more, respectively, depending on the specific application of the Rule and Annex III requirements). * **D) Automatic sounding of the signals is not permitted.** This is incorrect. COLREGs Rule 35 (Sound Signals in Restricted Visibility) permits the use of automated signal-generating devices (signal timing controllers) to produce the required mandatory signals (e.g., the prolonged blast every two minutes for a power-driven vessel underway), provided the equipment is capable of being instantly switched off and manual control is possible.