Next message: David Weilacher: "Re: Level of observation accuracy in medium seas"
"Did a noon sun shoot within seconds of local noon with 0 magnification sight
tube."
Just curious, did you do anything to verify your calculation that it was
local noon? Did you check the altitude before and after to see that it was lower?
Generally, the limiting factor for accuracy is the horizon itself. It takes
practice when there are significant waves getting used to picking off altitudes
at the moment when you're seeing something approximating a true horizon.
Beyond that refraction can shift the horizon up and down in ways that "dip" tables
only partially correct. You could count +/-1.5 minutes as very good.
Frank R
[ ] Mystic, Connecticut
[X] Chicago, Illinois
