The file usertp.txt holds the user defined waypoints. This is best accessed through the turnpoint edit facility in the program but may also be edited by hand if desired. The following defines the format of this file.
The file consists of a number of waypoints, each on a separate line.
The above example shows the format of each entry in the file. Specifically it comprises four fields separated by spaces:
The length of each field is important and the two ordinates must include leading zeros to ensure the length is correct.