Linked from
The 9 pages that link to Rhumb line, each with the reason it gives.
LatitudeRelated: On a Mercator chart, a rhumb line appears straight, unlike most shortest routes.
Gerardus MercatorRelated: The 1569 map made constant-compass-bearing routes straight lines.
Compass roseRelated: Directional lines radiating from a rose can guide constant-bearing navigation.
Piri ReisRelated: Portolan charts use networks of these lines to represent navigational bearings.