Potential answers for "Sub's navigational aid"

⭐⭐⭐⭐ SONAR
⭐⭐⭐ GPS
⭐⭐⭐ LORAN
⭐⭐⭐ CHART
⭐⭐⭐ STARMAP
⭐⭐⭐ LODESTAR
⭐⭐⭐ ROADMAP
⭐⭐⭐ CANAL

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