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The speed of a current, usually expressed in knots. On Pilot Charts and other references we often see drift expressed in nautical miles per day.

There are also world maps showing currents in Bowditch, along with a discussion of the currents. See set. See also error current.

See also set and error current. See also course over ground (COG) and speed over ground (SOG) because it is the difference between these two GPS values and the knotmeter and compass values that tell us we are being set by current or blown off course by wind (leeway).

See also Tricky Terms in Navigation.

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