A Velocity Tracker is an advanced T'au sensor suite that consists of sophisticated motion detecting and heat seeking sensor systems designed to track the movements of airborne targets such as aircraft.
With a Velocity Tracker system, the bearer can accurately bring his weapons to bear on otherwise hard-to-hit high-flying targets before blowing them out of the sky.
- Codex: Tau Empire (6th Edition), pg. 69
- Rogue Trader: Tau Character Guide (RPG), pg. 34