Lectures in Navigation

by Ernest Gallaudet Draper

.R.A. +

.C.P. = G.S.T. (R.A.M.G.) If the result is more than 24 hours, subtract 24 hours.
G.S.T. -

.R.A. -

.C.P. = G.M.T.
G.S.T. - W.Lo. = L.S.T.
+ E.Lo.
L.S.T. + W.Lo. = G.S.T.
- E.Lo.

I can explain all these formulas very easily by the following illustration which put in your Note-Book: (Note to Instructor: If possible have copies of this illustration mimeographed and distributed to each student.)