Related Clues:

• Awareness, metaphorically
• Weather team's need
• Stage school runs system to identify high-fliers
• Motion detector, for example
• Means to track bishop with grasp of computer language
• Get out of the rag trade - it's something the traffic police like to point out
• Instrument to detect and track distant objects
• Airplane tracking device
• Plane device, back and forth
• Air-traffic control device
• Echolocator
• Fly high across pole with echo-sounder
• Eye or ear
• Under the __ (drawing little attention)
• Whale tracker