Related Clues:
- Bats navigate with it
- Device with blips
- Method of investigating something fishy?
- Echolocator
- Fly high across pole with echo-sounder
- Whale tracker
- Turns up, sought office near ocean school tracking underwater craft
- Shipwreck hunter's aid
- Vessel detector
- Salvage mission aid
- 'The Hunt for Red October' device
- Capability of whales and dolphins
- Guiding light is responsible for a slight blip
- Wreck locator
- Method of echolocation