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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.: Burch, David, Burch, Tobias: 9780914025603: Amazon.com: Books
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After a lengthy delay in satellite launches caused by a variety of technical problems, the new civil GPS signal — L5 — began
![GPS Backup with a Mark 3 Sextant: All Instructions and Tables Included; For Any Ocean, on Any Date; No Background in Celestial Navigation Required., Burch, David, Burch, Tobias, eBook - Amazon.com GPS Backup with a Mark 3 Sextant: All Instructions and Tables Included; For Any Ocean, on Any Date; No Background in Celestial Navigation Required., Burch, David, Burch, Tobias, eBook - Amazon.com](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/41vncq9hiIL.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., Burch, David, Burch, Tobias, eBook - Amazon.com
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