Related Clues:
- Aid in finding sunken ships
- Fishing-boat accessory
- Sub apparatus
- Ship tracker
- Dolphin sense
- Device for detecting objects used in arson
- Device for detecting objects under water with sound waves
- Underwater echo sounder
- Thus one hurried up to get the echo
- Thus one hurried up with the help of an echo
- Does your boy get the artist back to help with the navigation?
- Fish-finding aid
- Your boy is up to painting this, by the sound of it
- 'Thus ran back, by the sound of it (5)'
- Mine locator