Potential answers for "Underwater navigation aid"

⭐⭐⭐⭐ SONAR
⭐⭐⭐ URL
⭐⭐⭐ SPEARGUN
⭐⭐⭐ ECHO
⭐⭐⭐ GPS
⭐⭐⭐ LORAN
⭐⭐⭐ AUTOPILOT
⭐⭐⭐ POLARIS

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