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Lines radiating across a sea chart.
Also known as: Portolan lines, Wind rose network, Loxodrome network
The network of straight lines radiating from compass roses across a medieval sea chart.
Provide bearings across a medieval sea chart by radiating straight lines from compass points.
Contexts: Navigation, Maps
Let a navigator lay a course by finding the radiating line nearest the intended track, so the web is a lookup table drawn across the chart rather than decoration.
Contexts: Navigation, Maps
Straight on the chart and curved on the globe, which is why courses laid this way lengthen over long distances — a limitation invisible to the chart's users and not discovered until much later.
Contexts: Navigation, Maps
Straight lines radiating from several points around the chart, crossing each other in a dense web across the sea areas.