Originally Posted by Trimix
Cheers, that's kind of what I copied out of my radio book, but I also wondered if I should just say "press the RED button" ?
Or perhaps red distress button first, then follow it up with actually talking on the radio ?
If I recall correctly, the DSC distress button will send an alert on the appropriate frequency (along with MMSI, position if connected, and type of emergency if entered), then switch to a voice channel.
In the US, the initial DSC call goes out on channel 70, then the unit waits for a DSC acknowledgement (while monitoring 16). If no ack comes, it sits on 70. If reply is received, all is good and survivors can talk away; if not, they may need to select 16 to communicate. [Note: this is on my SH radio; YMMV.]
IMO, "Press the red button" should do OK, as, assuming the events unfold as they should, people should be able to hit the button and talk (Note: actual sequence should be spelled out clearly: on mine, it's "Press the red button, then when display says 'DISTRESS', press and hold the red button until the countdown finishes.")
If the call goes unacknowledged, then a separate voice Mayday call should be made on channel 16 (in case there are non-DSC stations within range.)