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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
In navigation, a rhumb line, rhumb (/ r ʌ m /), or loxodrome is an arc crossing all meridians of longitude at the same angle, that is, a path with constant bearing as measured relative to true north.
Over a longer oceanic passage, it makes sense to travel on a Great Circle Circle than the Rhumb Line due to the extra time and energy involved. Sailing between Cadiz (Spain) and Miami (US), this could amount to a day’s sailing over the passage ( 150 NM less).
A broader definition of portolan chart accepts any sea chart or atlas that meets the following series of stylistic requirements: drawn by hand, with a network of rhumb lines that emanate from the center of hidden circles, focused on the coasts and islands, with place names written perpendicular to the coastline on the land side and with sparse ...
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.
27 sty 2020 · Draw a straight line from your start to your destination and that course will have a constant heading all the way. Without any adjustments along the route, your compass will always indicate the same direction to go. Every straight line on a Mercator Projection map is a rhumb line.
Calculating the distance between two points along a rhumb line. In the next diagram, A, B, C, D and Z are meridians of longitude; the lines aB, bC, and cD are different parallels of latitude; and the line ABCDZ is a rhumb line.
