Like you, I had the same thoughts about the drone - “who aboard is going to listen?” However, there are common radio frequencies used in the aviation community - 121.5mhz & 243.0mhz. These frequencies are similar to the maritime VHF16. I’d like to believe that attempts were made on these freqs.
The “sacred” space around a navy ship “might be” 100 yards - ONLY WHEN THE SHIP IS MOORED, not underway. As far as underway, I’m not aware of any “specified” zone, but my experience in operating on a commercial vessel in the vicinity of the navy is that they like 1 mile, except in congested fairways.
Here’s a math question for you: How much time for the drone to close 1000 yards if the drone’s speed is 60Kts; 100kts? Do you remember the “3 minute rule”? There isn’t a hell of a lot of time to do something once the aircraft is within 1000 yards. . .