Next message: Fred Hebard: "Re: Question about Davis Mk 25 sextant beam converger"
Greg-
Even with a better sextant, it is "proper" practice to check for IE every time you use the sextant. I've seen IE hold at zero for a zero, even with changing temperatures, but all it takes is one bump, one slip, and then your sights are down the drain. Far more "professional" to check it every time so you know it hasn't changed, instead of assuming so.
The plastic sextants are supposed to be less stable with temperature change, so that taking one from a warm indoor home out into cold air, or taking one and leaving it in hot sunlight, etc., all can cause thermal changes in the frame, which bring changes in the IE.
