For faster manipulation, the coordinate list is sorted. While the actual coordinate list is physically located on the disc (file .crd), the data on points sorting (file .crx) are loaded in the computer's memory for faster manipulation.
The coordinate list can be sorted in three ways:
According to the prefix
Primarily, the points are sorted on the list according to the prefix and secondarily according to the point number. Therefore, the points with the same prefix and different point number follow in the file. This is the most common method of sorting.
According to the number
The points are sorted primarily according to the point number and secondarily according to the prefix. The points with the same number and different prefix follow in the file.
Unsorted
In this case, the points on the list are not sorted; they are kept in the order that they were added to the list. However, the order will be broken by e.g. file compression, if set a different sorting (when compressing a file, a new file is created where all the points are reported in the order they are dis-played at the moment of the compression.).
Sorting according the prefix and according the point number applies only to the points with numeric identifiers. For the points with alphanumeric identifiers, the prefix or number isn't recognized; these points are sorted alphabetically (similar to a phone book).
The way of sorting can be only set for the GROMA system globally; you can't choose a different sorting method for each list. You can set the sorting method in Settings->Environment.