A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John D. Howard
Date: 2018 Nov 15, 07:51 -0800
I think it was the popular use of the sextant with worm gear - drum. Easy to mark off tenths. Also the " New Navigation " where you drew a line on a plotting chart. One minute equal one mile. Easy to mark off tenths of a mile.
John H. 41N 100W