Related Clues:

• System of detection
• Underwater location equipment
• System for pinpointing ships and aircraft
• Electronic detection system
• System for locating distant objects
• Method for detecting distant planes, ships etc
• Range and direction finding equipment
• Equipment for locating objects
• System for locating underwater objects
• System that detects and locates distant objects
• It sweeps the area back and forth
• Hydroacoustic tool
• Electric eye, for example
• Traffic controller's tool
• What a trooper may point at you