alt Hacker News>Satellites have hard time taking pictures of every square mile of a sea to find any ship, yet alone the one you need.
That's why satellites use radars and scientific instrumentation magnetometers to find stuff like ships or even subs underwater.
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post-it • yesterday at 5:38 PM
Those suffer from the same problem. There's a lot of ocean, and if you don't know where to look then you won't find what you're looking for.
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There might be some secret technology that we're unaware of but as far as we know magnetometers can only be used to detect underwater targets at very short ranges. I highly doubt that they're used on military reconnaissance satellites.