Before revision: Rhumblines vs. windrose lines upright=1.25|A part of the Catalan Atlas Before modern accurate surveying, there was no method for measuring longitude at sea so maps used to have many distortions, especially in the east west direction.
After revision: Rhumblines vis-à-vis windrose lines upright=1.25|A part of the Catalan Atlas Before modern accurate surveying, there was no method for measuring longitude at sea so maps used to have many distortions, especially in the east west direction.