Functional as of version 01.027.006, the Gatling turret is a powerful automatic weapon which will target and fire upon the nearest Decoy, moving object, or meteor within its operational range (adjustable via its control panel). In Survival Mode it must be loaded with 25x184mm NATO Ammo Containers to fire.
It's advisable to link the Gatling turret with connectors to the rest of the cargo system on the ship or base, as it will pull more ammunition automatically if it needs it (and is toggled to do so).
The turret take the space of a 3x3x3 cube despite its appearance. Keep this fact in mind when placing turrets near thrusters as they will be damaged.
If you are using the Gatling turrent for meteor defense, consider that meteors come from the direction of the sun. You can save a lot of ammo if you place blocks around the Gatling turret to prevent it from shooting at meteors that have already passed beyond the position to hit your base.
Gatling Turrets can be placed on top of a piston and extended to provide more freedom of angles during battle.
If you lack space for this, an Interior Turret might work.