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Nesessity of Sextant

Why navigator needs sextant with 02 big aspects

Sextant is the most effective device for GPS problem on the ocean

Examples of GPS malfunctions

(65 cases in 2018, 76+ cases in 2019)

1998
US Naval Academy decided to drop celestial navigation from the formal curriculum
2006
US Naval decided to drop the sextant training from the formal curriculum
2011
US Naval started again celestial navigation training
2015
US Naval Academy started again celestial navigation classes




Sextant is independent device that can verify GNSS system

  Ship Inspection Report (SIRE) Programme (VIQ 6) - 2014 Edition


  Ship Inspection Report (SIRE) Programme (VIQ 7) - 2019 Edition


  A Guide to Best Practice for Navigational Assessments and Audits- 2018 Edition


  Navigation and Vessel Inspection Circular NO. 02-18 - 2018 Edition




Reported cases of GPS Malfunction

[Source] U.S Department of Homeland Security - GPS Problem Report (https://www.navcen.uscg.gov/?Do=GPSReportStatus)