Astromech Droid
Specializing in starship maintenance
and repair,
astromech droids also assis with
piloting and navigation.
They come in a variety of models,
and are used by many
starfaring civilizations.
The R2 unit is especially popular.
They can operate
in deep space, interfacing with
fighter craft and
computer systems to augment the
capabilities of
ships and their pilots, usually
from a socket
behind the cockpit.
Astromechs also have flotation devices
and a
periscoping visual scanner that
can guide them
while they are submerged.