In certain navigation or surveying problems, the direction or bearing
In certain navigation or surveying problems, the direction or bearing

Trigonometry Lecture Notes, Section 2.5
Trigonometry Lecture Notes, Section 2.5

rubenstein - hhshurtgeo
rubenstein - hhshurtgeo

geometry, angle, and trig exercises
geometry, angle, and trig exercises

Notes 8 - Garnet Valley School District
Notes 8 - Garnet Valley School District

Lesson 11
Lesson 11

Rule of marteloio



The rule of marteloio is a medieval technique of navigational computation that uses compass direction, distance and a simple trigonometric table known as the toleta de marteloio. The rule told mariners how to plot the traverse between two different navigation courses by means of resolving triangles with the help of the Toleta and basic arithmetic.Those uncomfortable with manipulating numbers could resort to the visual tondo e quadro (circle-and-square) and achieve their answer with dividers. The rule of marteloio was commonly used by Mediterranean navigators during the 14th and 15th centuries, before the development of astronomical navigation.