From 5 miles up you can see pretty good on the ocean below. Anything longer than 50ft sticks out. Even on choppy days a single boat with no wake sticks out against the random pattern of waves.
Aircraft Carriers stick out pretty good with escorts spread out pretty far around it.
I just saw this from 3 days ago: http://www.nbcnews.com/storyline/missing-jet/sightings-missi...
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