# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Figuring Course given Lat/Long of destination
From: Ed Kitchin
Date: 2000 Feb 27, 3:50 PM

```An interesting problem appears in the latest issue of  "Ocean Navigator" Which
asks that you figure the course to a destination given origination and
destination. It would seem easy to determine the difference in lat. (The
destination was over several degrees of lat.), but deg. of long. differ in
length as you change lat. One could simply take the mean of the two given
long. and use that, but that bothers me as not being all that accurate. There
is the error of the Macerator thing. You could use universal plotting sheets
and construct using a vertical representing diff./lat., then draw a
horizontal from the top of the lat. fig., representing the long. at the
destination, and draw a hypotenuse as the course line. (???) Are there any
mathematicians out there to
give me a good formula to learn for this task? Thank you.

Ed Kitchin
```
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