On the sea there are 2 levels of distress. Things are going wrong and may end up in a mayday call (pan pan) and things have gone wrong human life is in imminent danger.

I have no doubt that a boat without propulsion is a pan pan call.

When traveling the seas a watch must be maintained at all times using all available means. This involes looking, listening, and the use of any electronics available. The most common electronic device on a boat is probably a VHF radio. Channel 16 is the channel to monitor on watch. Well equipped boats will have multiple VHF radios to monitor more then one channel.

I have no doubt the boat was well equipped with a professional captain. The other professional Captain in this story made a stink because launchpad was the closest vessel and they ignored a very old fundamental rule of the sea.

This story has a happy ending because another vessel stepped up. We don’t know the alternative.

The Captain of the Launchpad is choosing the inability to keep a vhf radio set to channel 16 rather than admit they ignored the call.

Based on the wording of the response, and a review of the ship tracking data, it appears that Zuckerburgs yacht may have been actively communicating on a different channel, and once they switched back, the assistance from the cruise ship was already underway.

Again, more facts may be revealed, but as of right now, I don;'t see any reason to believe the crew did anything wrong.