Limb to use- Upper or Lower?

[BigBill]

That's a good idea, BigBill.  Using the same method I only correct for Refraction and IE but never parallax as it's too small to make much difference.

Making an AH that's covered is pretty simple.   CelNav57 made one-

Here-  Artificial Horizon

I had one made by Davis Instruments made of plastic.  It's rather junky and a nuisance too work with.



Ed

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I use a Davis AH, as mentioned it can be a pain in the butt. IN my case I use it often on my deck so my walking or the dogs moving about is the main culprit. It is generally more accurate than my bubble sextant though.
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