Magnetic compass divided into four 90 deg sections
from - Wrinkles in Navigation - Lecky, S.T.
19th edition
page 16
larger illustration
From Bowditch - American Practical Navigator - 1962 edtiion - noted on page 137.
"An older system still used somewhat is to graduate the card through
90 degrees in which each quadrant, increasing from both north and
south."
Return to the page with a more complete
discussion and the smaller image of this compass card.
History of Compass page.
Return to the Nav index page.