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“The keel counteracts the weight of the wind on the sails, enabling the boat to remain more upright. It also reduces leeway, the distance the boat veers from its compass course.”

"Bucking a bit, isn't she, Thompson?" he remarked to the helmsman, who, relieved of the responsibility of maintaining a constant altitude by the fact that the airship was automatically controlled in that direction, was merely keeping the vessel on her compass course.

She was steering a compass course with the wind almost dead aft.

The Albatross was flying magnificently, her pilot holding on to a compass course, after making due allowances for the "drift" of the air current.

After a march of two days along the river bank, they struck across the barren grounds, taking a direct compass course for Point Lake.