A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Swartz
Date: 2022 Nov 17, 21:08 -0800
According to Irvin in his book Aircraft Instruments--1941, The Pioneer Aircraft Octant Type 342 (A-5) has natural horizon capabilities.
The 1944 ed. of USAAF Navigator's Information File mentions the Pioneer A-7 sextant as having a natural horizon mode.
Both have radium paint for bubble illumination, although the A-5 also has an electric light which was eliminated on the A-7.
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