Analog and digital navigation in the late middle ages / James E. Kelley

This study is part of a search for insights into the early evolution of European nautical (portolan) charts and navigation methods. Topics covered include: historical perspectives; geometrical navigation; Raxon del Marteloio theory; the "Circle and Square"; the Egerton MS.73 "How to Do It" Manual; Pietro de Versi's Raxion del Marteloio; Ramon Lull on Navigation; origins of the Raxon del Marteloio. Contains numerous diagrams.