Related Clues:

• Robert Watson-Watt led the practical development of this location system
• Weather bureau tool
• Aviation equipment boom involving commercial for oxygen
• Air traffic control equipment
• Device for tracking distant objects
• This helps one find ships in waves going up and down
• A blip on the ___
• Evidence provider for some citations
• Location finder is bidirectional and excellent on most craft
• Storm-tracking technology
• What detects flights heading east and west
• Palindromic tracker
• Under the ___ (unnoticed)
• Equipment in a control tower
• It echoes with no effect? Yes and no!