# NavList:

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

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
Re: The Great Circle Challenge
From: UNK
Date: 2014 Dec 27, 12:14 -0000

Apologies I made an error on the Bygrave. Several check repeats now give 4059 nm distance. 25˚55’ course.

Francis

From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
Sent: 27 December 2014 09:41
To: francisupchurch---.com
Subject: [NavList] Re: The Great Circle Challenge

Merry Xmas Navlist folk.

The following probably adversely affected by seasonal excesses.

Bygrave: Course 25˚55’, dist 4063nm. Took 2 minutes. (substitute Dec= arrival lat, LHA (t) = difference longitude.)

Brown-Nassau prototype: Course 26˚. Dist 4070nm. Took 1min 30 secs approx.

What is the best ,correct answer?

Best wishes,

Francis Upchurch

From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of David Pike
Sent: 26 December 2014 16:21
To: francisupchurch---.com
Subject: [NavList] The Great Circle Challenge

The Great Circle Challenge

Clearly, from recent posts, we all have a favoured way of solving great circle sailings (which we’ll probably never use for real).  Let’s put them to the test by trying something a bit more complicated like a southern to northern hemisphere crossing combined with a crossing of 180degrees E/W.  How about emulating Captain Cook by travelling from Cook Strait (CS), New Zealand to Waimea Bay (WB), Kauai, Hawaii?  Cook followed the pretty route, but we’ll go direct by great circle.  The coordinates are CS 41d 30’S, 174d30’E to WB 21d57’N, 159d 40’W.  Use your favourite method and report back on your answer, the time it took you, and any difficulties encountered.

I’ll stick with the diagram method, because at least I’ll know what I’m trying to prove, and I won’t have as many rules to remember and apply which might or might not work.  Dave

Browse Files

Drop Files

### Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

### Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

### Email Settings

 Posting Code:

### Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)