NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Hp by Doniol for Aircraft
From: Gary LaPook
Date: 2014 Dec 2, 12:51 -0800
From: Francis Upchurch <NoReply_Upchurch@fer3.com>
To: garylapook@pacbell.net
Sent: Tuesday, December 2, 2014 11:36 AM
Subject: [NavList] Re: Hp by Doniol for Aircraft
From: Gary LaPook
Date: 2014 Dec 2, 12:51 -0800
When you are planning your voyage estimate your time at each waypoint and for a couple of hours either side work up curves for the sun and moon for the day and for several stars at night. See:
gl
From: Francis Upchurch <NoReply_Upchurch@fer3.com>
To: garylapook@pacbell.net
Sent: Tuesday, December 2, 2014 11:36 AM
Subject: [NavList] Re: Hp by Doniol for Aircraft
Hanno,
I don't think any of us old romantics are seriously suggesting we do a Chichester as per 1931(he was crazy even then). I never go anywhere on my boat without multiple GPS back-ups, but just like to play with astro, celnav and the old Chichester stuff like Bygraves etc. In an emergency, the GPS rules.
Anyways, this recent thread on precomputed Hps is fascinating and I intend to try it out on my next boat trip to Scillies. I've already worked out my "waypoints" with the Bygrave and will now also test the Brown-Nassau.
Best wishes
Francis
