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![GPS Backup with a Mark 3 Sextant : All Instructions and Tables Included; for Any Ocean, on Any Date; No Background in Celestial Navigation Required [Paperback]](/itemImage/2/9/3/3/2_5980531.jpg "GPS Backup with a Mark 3 Sextant : All Instructions and Tables Included; for Any Ocean, on Any Date; No Background in Celestial Navigation Required [Paperback]")