Related Clues:
- Weatherman's backdrop
- Echolocation method
- Subway guide
- Bass boat feature, sometimes
- Scientific breakthrough of the '30s
- Place to find a legend, often
- Sub locator
- Plane-tracking device
- Pitching coach's aid
- Speeder snagger
- It may give relief
- Cartographer's product
- Encyclopedia graphic
- Navigation need
- ___ gun