Which of the following has NOT been designated for GMDSS "On-scene" or SAR communications?

Which of the following has NOT been designated for GMDSS "On-scene" or SAR communications?

• A. A. VHF Ch-16
• B. B. MF radiotelephony on 2182.0 kHz
• C. C. SITOR (NBDP) on 2182.0 kHz
• D. D. HF radiotelephony on 4125.0 kHz

Answer: (C)

For this question regarding GMDSS (Global Maritime Distress and Safety System) "On-scene" or SAR (Search and Rescue) communications, the correct answer pertains to the designated frequencies typically utilized for distress and safety communications. The SITOR (Selective Identification and Telecommunications Over Radio) mode, particularly on 2182.0 kHz, is primarily reserved for distress and emergency communications using narrow-band direct printing (NBDP). However, it is not considered an "On-scene" communication method. While it is used for distress scenarios, it fits more into the category of initial maritime communications rather than direct on-scene SAR coordination, which is better supported through voice communication systems. On the other hand, VHF Channel 16 is a designated emergency frequency widely recognized for marine distress calls and is routinely used in on-scene communications among vessels in the vicinity of a rescue operation. MF radiotelephony on 2182.0 kHz serves a similar purpose for medium frequency scenarios, and HF radiotelephony on 4125.0 kHz is also designated for maritime distress communications. In summary, while SITOR on 2182.0 kHz is valuable for distress signals, it does not serve the on-scene communications purpose

For this question regarding GMDSS (Global Maritime Distress and Safety System) "On-scene" or SAR (Search and Rescue) communications, the correct answer pertains to the designated frequencies typically utilized for distress and safety communications.

The SITOR (Selective Identification and Telecommunications Over Radio) mode, particularly on 2182.0 kHz, is primarily reserved for distress and emergency communications using narrow-band direct printing (NBDP). However, it is not considered an "On-scene" communication method. While it is used for distress scenarios, it fits more into the category of initial maritime communications rather than direct on-scene SAR coordination, which is better supported through voice communication systems.

On the other hand, VHF Channel 16 is a designated emergency frequency widely recognized for marine distress calls and is routinely used in on-scene communications among vessels in the vicinity of a rescue operation. MF radiotelephony on 2182.0 kHz serves a similar purpose for medium frequency scenarios, and HF radiotelephony on 4125.0 kHz is also designated for maritime distress communications.

In summary, while SITOR on 2182.0 kHz is valuable for distress signals, it does not serve the on-scene communications purpose