Unlike the Rocket Launcher, the Heat-Seeking Rocket Launcher automatically selects the nearest available target. It is based on the Russian/Soviet SA-18 Igla. When pointed at a vehicle the marker is green. After waiting for 3–5 seconds it turns red and the missile is locked on. It then tracks toward the target, making it useful for taking out air vehicles, such as Police Mavericks.
If shot launched without finding a target, after 100–200 metres, the rocket explodes. However, if chasing a target, but the target disappears before the rocket could reach it, the rocket will keep on flying until it disappears. (e.g. firing on Dodos or Rustlers.)
It can be noted that firing in lock-mode at an aircraft, the missile will go much faster than firing it at any other vehicle, including helicopters.
The sign of the rocket on the map is a small white blip, comparing altitude with the player as normal.
They are used by the NOOSE in The Ballad of Gay Tony, although the player can not access them in any way. It has been speculated that the "heat seeking" rockets are just rocket projectiles spawned and scripted to aim for Luis's vehicle, together with officers wielding RPGs to create the effect.
The Heat-Seeking Rocket Launcher (along with the normal RPG) is the only weapon which you can't aim and shoot with while being on fire. Instead, CJ will start making movements similar to using a Shotgun.
Unlike the Hydra and SAM rockets, this type of Heat-Seeking rocket can destroy any vehicle instantly.