A drone is a non-player controlled ship that typically is spawned by Cargo Ships when a player apporaches within range of it's anntenna as a means of active self defense. In addition players can also build and operate drones with a Remote Control block, however we don't go into detail here. Non-player spawned drones range from relatively harmless to serious threats, depending on the type of vessel spawning them. Typically Civilian Cargo Ships will spawn lightly armed Drones that can discourage players from attempting to board the cargo ship while military cargo ships, have much more powerful drones that can pose a serious threat to the player's ship. They spawn periodically and up to a limit, typically 3 once their ammunition is exhausted they are relatively harmless.