Simple "do-nothing" mission. The ship will move around, send you exploration reports, and only fight when attacked or when it finds a ship or planet matching its primary enemy.
In earlier host versions, you needed this mission to get an exploration report when you orbit a foreign planet. This does now happen all the time, so you can use a different mission for ships that don't do anything special, for example, Mine Sweep or Sensor Sweep.
Preconditions: ships must have fuel to be able to generate exploration reports.
Relevant PControl Stages: ShipExploration