Which frequency can NOT be used for receiving SafetyNETTM messages?

Receiving SafetyNETTM messages is generally conducted through specific frequencies allotted for maritime safety communications. The VHF DSC (Digital Selective Calling) on marine channels is not one of the frequencies designated for receiving SafetyNETTM messages.

SafetyNETTM is a service used primarily for broadcasting maritime safety information over the world, and it relies on medium frequency coastal stations or high-frequency radio for its operation. The two prevalent frequencies for SafetyNETTM messages are 518 kHz, which is a part of the NAVTEX system, and the appropriate HF SITOR (NBDP) frequencies, which are designed for more robust and long-distance communication.

The tropical NAVTEX frequency also falls into the categories used for accessing SafetyNETTM broadcasts. As a result, selecting VHF DSC on marine channels cannot be used for receiving SafetyNETTM messages since these channels are not utilized for that type of safety information transmission, thus marking it as the correct response in this context.