Capt. Mooron wrote:

They would be in contravention if no sail plan was filed.... ham radio
routing would inform all vessels in the area of her route and location,

And just how many ships do you believe are monitoring a hobby radio?

satellite phones are on most commercial and private yachts,

Yeah, how many phone numbers do you have for those boats?

that every vessel passing close to her route would have been informed.

By whom and by what method?

You have some peculiar ideas about what kind of comms are monitored by
vessels at sea ... and how to get information to them and receive
information about their position.

Rick