History of Tracking Module

Tracking Module is a weapon perk, an origin trait on Rocket Launchers. In-game it reads "Adds tracking capability to rockets. Locks onto targets when aiming down sights. Increases blast radius." Community guides add that tracking persists about one second after you stop aiming at the target and is weaker in Crucible.

Weapons

It can roll on Crux Termination IV, a Cassoid-made Arc rocket launcher introduced in Season of the Wish (Season 23), alongside perks such as Clown Cartridge, Explosive Light, Demolitionist and Slideshot.