navigation, the judgment or estimation which is made of the place where a ship is situated; without any observation of the heavenly bodies. It is discovered by keeping an account of the distance she has run by the log, and of her course steered by the compass; and by rectifying these data by the usual allowances for drift, lee-way, &c., according to the ship's known trim. This reckoning, however, is always to be corrected, as often as any good observation of the sun can be obtained.