You could possibly spot container ships at one instance in a day (the constellation only goes over any point twice a day, ~10.30 AM (local) and 12 hours later (

You could possibly spot container ships at one instance in a day (the constellation only goes over any point twice a day, ~10.30 AM (local) and 12 hours later (no sunlight)). To what end? You are roughly tripling your power, data storage, and downlink costs, with a loss on your power production (and orbit control, because the Doves use differential drag for phasing) for a poor product that doesn't really have customers. If you want to track ships that want to be seen, basically everybody has AIS receivers up there (although I understand that's not trivial to sort out from space). If you want to track ships that aren't broadcasting, use radar.