Related Clues:
- Submarine navigation aid
- Naval mine detector
- Modern bass boat device
- Underwater navigation aid
- System for detecting characters involved in arson, repeatedly
- Shipwreck-finding tech
- Sound-based detection method
- Submarine seeker
- Sub detection device
- Device for detecting underwater objects
- Underwater tracking device
- Oceanography device
- Dolphins use it to navigate
- Echo locator at this degree of proximity away from base
- Toothed whale's technique