The lines on this chart are rhumb lines, which means they could be used for navigation because they represent a constant bearing line relative to magnetic north.
The lines on this chart are rhumb lines, which means they could be used for navigation because they represent a constant bearing line relative to magnetic north.
The lines on this chart are rhumb lines, which means they could be used for navigation because they represent a constant bearing line relative to magnetic north.
Wikipedia - Rhumb line
Wikipedia - Portolan chart
The lines on this chart are rhumb lines, which means they could be used for navigation because they represent a constant bearing line relative to magnetic north.
Wikipedia - Rhumb line
Wikipedia - Portolan chart