- the pursuit (of a person or animal) by following tracks or marks they left behind
- I'm tracking a buck.
- Send me the tracking number please.
- Oh, while I remember, it seems that that was a bug that occurs when you use the comment field's 'letter-spacing' tag which adjusts the tracking.
- Pollution tracking
- Tracking and tracing system
- Weather balloon tracking radars.
- Automatic tracking aid (ATA)
- weather balloon tracking radars.
- Automatic tracking aid 
- Material tracking during production
- vessel tracking and tracing systems;
- Target acquisition or tracking systems;
- Vessel tracking and tracing systems
- Second automatic tracking aid 
- International shipment tracking and tracing.