She usually changes her course several times, and as a ship's position by D.R. is only computed once a day-at noon-it becomes necessary to have a method of Obtaining the result after several courses have been sailed.
"Lectures in Navigation"
Ernest Gallaudet Draper
Put in your Note-Book: Formula for Obtaining Line of Position by M. St. H. Method.
"Lectures in Navigation"
Ernest Gallaudet Draper
It became their mine of treasure, more precious than gold; it was their only means of making weapons for Obtaining that which sustained life.
"My Attainment of the Pole"
Frederick A. Cook