This video is part 3 of the "Getting Started in Celestial Navigation" video series.
Part 3 of "Getting Started in Celestial Navigation," (Precision) describes the process of correcting a sextant reading to obtain a more accurate result based on the standard corrections of index error, height of eye, and main correction. It also refines the process of finding declination, and introduces Greenwich Hour Angle.
Here are some additional resources pertaining to this lesson:
1. Wikipedia "Geographic Position" - en.wikipedia.org/wiki/Geographic_coordinate_system
2. Wikipedia "Sextant"
3. Wikipedia "Declination" - en.wikipedia.org/wiki/Declination
4. Wikipedia "Hour Angle"
5. The Bridge Refresher Guidebook "Standard Sextant Corrections"
All example problems in this course use the 1981 Training Nautical Almanac and HO229 (there are three example problems in this lesson).
1. The 1981 Nautical Almanac
Hardcopy 1981 Training Nautical Almanac - amazon.com/The-Nautical-Almanac-1981-Training/dp/0914025260
Note you can also download for free or minimal price online by searching google, for example ebookpie.com/ebooks/300803-the-nautical-almanac-1981-for-training-purposes-only. You can download it from lapware.com if you pay the monthly fee for access. Sidenote - lapware is an amazing training tool!
2. HO229 - Sight Reduction Tables for Marine Navigation
Free download - msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0013
3. Other materials of use
Free download of Bowditch (The American Practical Navigator) - msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0002
USCG licensing website. This contains all the possible questions on USCG exams - uscg.mil/nmc/training/exams/deck/default.asp
The book I used to learn celestial navigation myself, and I think one of the best celestial navigation books out there, is "Common Sense Celestial Navigation" by Hewitt Schlereth - amazon.com/Commonsense-Celestial-Navigation-Hewitt-Schlereth/dp/0809272199
Produced and presented by Christopher D. Nolan, USCG cutterman (8 years) and US merchant mariner (500 ton Oceans). Currently on sabbatical aboard S/V Navigator.