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The figures 13 and 31 in the old runway numbers are the shortened forms of the magnetic bearing — or direction — the pilot needs to steer to line up with the runway.

Having carefully indicated the required direction by placing two stakes in a line with the magnetic bearing, Captain Jeremy gave the word for the men to proceed, and, wielding their hatchets with a will, they began to cut the path that was to extend two miles in a straight line; for the track cut by Captain Jeremy years ago was now almost totally obliterated, though we had found traces of it in the swamps.

"North 88 east," said Fuller to himself, as he read the magnetic bearing.

If Dwight Eisenhower's extraordinary hold on the American people were solely due to the fact that he has a warm personality and a magnetic bearing, we might have justifiable reservations .

“You’ve got the magnetic bearing,” said Scarlett, taking the instrument from the girl’s hand.