Related Clues:
- Echolocation apparatus
- Storm-finding system
- Storm-tracking device
- Astronomer's tool
- Tracking system
- Tracker's tool
- Airport tracking device
- Meteorological aid
- Speeder detector
- Traffic controllers' device
- Speed demon's nemesis
- Technique using beam that reflects without distortion
- On reflection, not changing system of detection
- System of detection by echoes
- Remote range sensor