A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2015 Oct 23, 16:52 -0400
I was reading HO551, Manual of Ice Seamanship.
After a discussion of abnormal refraction and the care a navigator should take in regards to it, the following interesting statement is made
"If the motion of the ship permits use of a bubble sextant, it can quickly be determined whether the apparent horizon is appreciably displaced"
The manual gives no further information.
Am I to infer that a bubble sextant can be used as a dip meter. Or is it merely a gross check, as in 'the horizon is far from normal'.
Has anyone tried this? Can a bubble sextant be used as a dip meter?