03/09/2022
Boater U’s “Celestial as a back up to GPS” course provides a means of learning and executing a position fix at sea when a vessel has lost its GPS navigation. Using the inexpensive plastic Davis Mark III sextant and David Burch’s text on it’s use, mariners will have a solution that is compact and inexpensive, using tables and procedures that are easy to learn and use.
https://boateru.com/courses/boater-103-backup-to-gps/
Boater U is a Boat school located in San Diego offering power boating lessons and boating safety courses from the instructors at TRLMI.