Many of you may remember past radar ocean surveillance satellites, perhaps most notably the Soviet US-A series of RORSATs: http://www.astronautix.com/u/us-a.ht

Many of you may remember past radar ocean surveillance satellites, perhaps most notably the Soviet US-A series of RORSATs: http://www.astronautix.com/u/us-a.html http://www.astronautix.com/u/us-a.html https://en.wikipedia.org/wiki/US-A https://en.wikipedia.org/wiki/US-A