rhumb line placement

[Midgardsormr]

Clarification: A cartouche is a label enclosed by a border, a map's legend and/or title is usually on a cartouche. The rhumb lines may emanate from beneath a compass rose placed in a cartouche.

On some maps, rhumb lines indicate bearing to a particular port or navigation point. The navigator plots the route from the rally point (from which the lines originate) to the destination port by simply aligning the heading along the rhumb line. Or they can run from rally point to rally point. This is an easy method of navigation requiring only a magnetic compass and an accurate chart.

[OldGuy]

Ah, I see that I had my terms confused as well. But I guess I still don't understand where rhumb lines should originate in order to be useful. My poor understanding leads me to think that they would be most useful if each port had rhumb lines emanating from them. But I don't ever remember seeing a map that incorporated them in that way.
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