More importantly:
1. Satellites are great for seeing things that do not move, but not so good as tracking moving things such as ships. Not only is the field of view limited, but the ship moves, and whilst the satellite comes back to the same point in its orbit, the Earth has moved.
2. Exactly what some of resolution do you expect from a Cubesat? Have any had a Earth Observation mission? No? What does that tell you?
3. Cubesats are only so cheap as they hitch a lift with a proper payload such as a satellite being launched in Geosynchronous Transfer Orbit.