A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John D. Howard
Date: 2019 Jun 9, 06:52 -0700
As long as the two pieces of plexiglass are the same, the refractions will cancel each other out.
I first used plastic years ago but found that glass works better - does not scratch as easy and does not move as much in the wind.
John H. 41N 100W