It is by using the name of the point toward which the ship is heading.
"Lectures in Navigation"
Ernest Gallaudet Draper
First, that when the bearing is taken, the exact heading, as shown by the ship's compass, is the heading shown by the pelorus.
"Lectures in Navigation"
Ernest Gallaudet Draper
The next correction is for the heading half way between, i.
"Lectures in Navigation"
Ernest Gallaudet Draper