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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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