Integrated scanner. Hunter-killers have scanners integrated into their audio/visual sensors. This means that they are always considered to be using a scanner.
Designated target. Hunter-killers can be programmed to destroy a specific target. They will not stop until that target is destroyed. With full databanks of the target's weaknesses, the hunter-killer ignores any SOAK that the target possesses. Programming a hunter-killer in this way takes one day.