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Mr Boersma,

you wrote:

"Thanks to Mr. LaPook's posting of several snippets from Harold Gatty's Raft 
Book, I was able to experiment with some of the methods described and I was 
impressed with the results -- latitude by length of day as computed by his 
tables gave me a latitude within 7min of my actual latitude.

Congratulations on this feat. Could you describe your experience? Did you have 
a sea horizon with a view of both sunrise/sunset , along with a sea-level 
stretch of coast (beach)? Were you on a boat? If you were inland, did you use 
your height above sea-level and a level shadow marker?

It would be interesting to know that.

Christian Scheele


----- Original Message -----
From: "mike boersma" 
To: NavList@fer3.com
Sent: Wednesday, January 27, 2010 5:06:52 AM GMT +02:00 Harare / Pretoria
Subject: [NavList] Impressed with the Raft Book



.

The longitude based on the time of sunrise was off, but this is due to the 
tables being developed for the 3d year in the 4 year solar cycle (1943) and 
not for the second year in the cycle (2010). I would think that the tables 
would be accurate for 2011.

Is there any evidence of the Raft Book actually being used by a novice 
navigator to successfully complete a voyage?
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