NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: C&P bubble sextant - practical issues
From: Tony Oz
Date: 2022 Mar 22, 14:22 -0700
From: Tony Oz
Date: 2022 Mar 22, 14:22 -0700
David, I presume that people use the bubble sextants because they have no big open water space near-by. Most probably there could be some small pond or a lake. Then, to be able to use it as the reference, one must be as low as water itself, to hunker down completely. In such a case the Dip is negligible, well within the error of judgement where the bubble's center is.
If one has access to the natural horizon as on the sea shore and wants to work comfortably - then, of course, the full-blown correction procedure is required: the HoE, the refraction - because the apparent horizon IS affected by atmospheric conditions significantly.
Warm regards,
Tony
60°N 30°E
