Related Clues:

• Finding method that's revolutionary
• Aid in scouting pitchers
• Speed-checking device
• It detects signals from north and south
• Either way, it pings your location back
• Salvage ship's detection system
• Technique using underwater acoustics
• Fish-tracking aid
• Britney Spears song about speeding?
• Weather tracker
• Two-way detection system
• Aircraft detection system
• Speed verifier
• Detection device that can confuse whales
• Echo sounder — arson (anag)