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The Cantino planisphere focuses on coastlines and how they relate to compass directions as indicated by the lines that crisscross the surface, called rhumb lines. This visual language stems from portolan charts
Simply, when plotting a course over a distance of 500 miles or more it usually makes sense to travel a ‘ Great Circle ’ route between origin and destination as it will be a shorter distance over the surface of the planet than the straight route - also known as the Rhumb Line.
1204. Rhumb Lines A rhumb line makes the same angle with all meridians it crosses and appears as a straight line on a Mercator chart. The principal advantage of a rhumb line is that it maintains 1. latitude.
Rhumb lines. Portolan charts are characterized by their rhumbline networks, which emanate out from compass roses located at various points on the map. The lines in these networks are generated by compass observations to show lines of constant bearing.
A rhumb line appears as a straight line on a Mercator projection map. [1] The name is derived from Old French or Spanish respectively: "rumb" or "rumbo", a line on the chart which intersects all meridians at the same angle. [1]
A rhumbline network (or windrose network) is a navigational aid consisting in multiple lines in a web-like grid drawn on portolan charts (and other early maps). These nautical charts were used in the medieval age and age of exploration in marine navigation .
Navigation Principles. Enabling Objectives. Know terms associated with the terrestrial coordinate system; Equator, Prime Meridian, Great Circle, Small Circle, Parallel, Meridian, Latitude, Longitude, and Rhumb Line. Understand the concept of Projections and the main projections used in Navigation.
