The Point Defense System of at least Escort sized space craft (I personally set this to anything above 5k metric tons, btw) can fire at each and every threat, including enemy fighter craft and even gunboats within Point Blank Range (page 114).
Says to treat the PDS as ultra-compact lasers.
At ISC (and Imperial) Tech Level that makes them Mk5 laser cannons.
The PDS has no HUD, thus may not benefit from Predict software.
The PDS has no gunner, so no skill bonus either.
What is the OB of the PDS against other space craft ?