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Right,

One needs to check IE each time the sextant is used.  But one doesn't
need to ADJUST IE to zero each time.

Fred

On May 8, 2006, at 10:45 AM, Red wrote:

> 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.
>

   

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