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The latitude of a survey line is defined and its coordinate length measured parallel to the North-South axis (or) latitude is the projection of a survey line on the North-South line. The Departure of a survey line is define as its co-ordinate length measured perpendicular to the meridian direction. In other words departure is the projection of a survey line on the East-West line.
Advantages of Latitudes/Departures:
Latitude and Departure - Video: