[Sjizzle]

Originally Posted by Capt Codetrucker

I really cannot remember HOW I used to reduce a shot, but if I am not oversimplifying, here is my process...

1. Shoot Polaris. Elevation = my latitude. No nautical almanac lookups necessary.
2. Record the time GMT.
3. Add/subtract the number of hours from last GMT Noon.
4. #Hrs x 15o = W longitude, if more than 180o, then 360o - W Longitude = E Longitude.

This is all I can remember. Is this correct?

here we go example

If it is 18.00 GMT when it is 09.20 local time on the same day, then local time must be 8 hours and 40 minutes behind GMT. Therefore Long = – [(8 x 15o) + (40 ÷ 60 x 15o )] = – [120o + 10o] = -130o = 130o West