There's a long-standing requirement at major ports that a local harbor pilot be on board to guide ships on their way in or out of a harbor. Requiring an obser

There's a long-standing requirement at major ports that a local harbor pilot be on board to guide ships on their way in or out of a harbor. Requiring an observer on board when transiting areas with a concentration of critical underwater infrastructure seems at least conceptually similar -- though the logistics of making it happen would be very different.