Latitude and longitude data represent the observations of the latitude or longitude of a survey station.
The observations are expressed in degrees, minutes, and seconds, followed by a hemisphere (E or W for longitude, N or S for latitude). As for horizontal angle data the angle can be expressed as degrees, minutes, and seconds, or using the HP calculator format.
The latitudes and longitudes are assumed to be ellipsoidal rather then astronomical values. They are not influenced by the deflection of the vertical.
Errors and residuals of latitude and longitude observations are expressed in seconds.