> TIL, the radar is detailed enough to ID the ships without using a submarine. Sonar, not radar. There are other types of sonar which produce good images, suc

> TIL, the radar is detailed enough to ID the ships without using a submarine. Sonar, not radar. There are other types of sonar which produce good images, such as side-scan sonar: https://www.shipwreckworld.com/articles/side-scan-sonar-images https://www.shipwreckworld.com/articles/side-scan-sonar-imag... Even Garmin makes them for ridiculously low prices (compared to what I remembered from the 1990s).