Potential answers for "Underwater tracking aid"

⭐⭐⭐⭐ SONAR
⭐⭐⭐ SPEARGUN
⭐⭐⭐ SCENT
⭐⭐⭐ SCUBA
⭐⭐⭐ REED
⭐⭐⭐ UPC
⭐⭐⭐ EARTAG
⭐⭐⭐ GPS
⭐⭐⭐ RADAR

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