A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John D. Howard
Date: 2015 May 1, 10:10 -0700
As backup to GPS / electronic nav for non-cel nav folk I would reccomend two books and a cheap, plastic sextant. The first book would be David Burch's "Emergency Navigation" and the second would be George Bennett's "The Complete On-Board Celestial Navigator".
I assume that even a non-cel nav boat captain will have paper, pen, rulers, compass, etc. on the boat.