Locking the points

The points on the coordinate lists can be locked against overwriting or deleting. The locking of the point is signalized by a sign of a lock in the left part of the coordinate list (before the point number). The points can be locked in two ways:

The locked points can't be deleted or overwritten. You can change them only by the point editing (for example using the key <Enter>) or after their unlocking. If adding a point with a number which already exists on the list, and if such point is locked, a standard dialog window with information on the coordinate differences is displayed, but only the option to keep the original point on the list without any change is available.