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Re: Old charts and traditional navigation methods
From: Don Seltzer
Date: 2014 Aug 13, 08:05 -0400

On 8/12/14, Jackson McDonald  wrote:
> I have attached three photos of a French nautical chart dated 1771.
> Like many old charts, this one contains numerous diagonal lines in addition
> to lines of longitude and latitude.
> How were these diagonal lines used?  How did they help a navigator plot his
> ship's course?

The diagonal lines are rhumb lines, and were used on charts with
Mercator projections.
They allowed navigators to plot courses of constant compass bearing,
rather than the more difficult great circle route between two points.

Don Seltzer

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