An account of the progress of a vessel, showing the courses steered by compass, with the distance in miles and fathoms run upon each course. These courses, corrected by allowances for leeway and variation, and the distances by allowances for heave of the sea and currents, form what is termed the corrected dead reckoning, which is used for ascertaining the vessel's place upon a chart, in default of observations of the celestial bodies to determine the same.