[nonameiguess]

The Navy knows every ship that is anywhere close to it, whether or not it has its AIS turned on, even if it's underwater.

[wahern]

The Navy can know, if it wants. Cataloging every pleasure boat and fish trawler days or weeks after the fact is something else entirely.

Also, the Navy's recent history of situational awareness isn't the greatest. See, e.g., https://features.propublica.org/navy-accidents/us-navy-crash...