A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Hanno Ix
Date: 2015 Feb 21, 14:42 -0800
How long did each reduction take you?
Compared are four short table reductions all performed on the same side of an index card. Weem's, Dreisonstok, Hughes, and Doniol. All are a pleasure to use without the need for a form. Weem's, Dreisonstok, and Hughes use an assumed position and log tables. Doniol uses a DR position and a natural haversine table. Doniol does involve a bit more math but makes up for it by using the DR position with a complete table set that fits in the wallet (try putting 229 in your wallet ;-).
(Short-Tables.jpg: Open and save)
(Short-Tables-Example.jpg: Open and save)