This method should be used only when steaming approximately a North and South course.
"Lectures in Navigation"
Ernest Gallaudet Draper
The entire coast was at this time placed on our charts as having a shore line along the one hundred and second meridian, approximately parallel to our line of travel.
"My Attainment of the Pole"
Frederick A. Cook
It is true that when recklessly used by ignorant and careless people it may be made a root of evil, yet as employed by the intelligent and careful expert it is not only perfectly safe, but it is the only known means of ascertaining approximately the actual number affected in a given herd.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler