When any station or gravity reading parameter is changed, project is marked as "dirty" and all loops of the project are recalculated twice.

In the first pass, loops are solved and absolute gravity values for each enabled reading are calculated. In the second pass, cross-loop repeats are processed and correct gravity values to all stations with repeated cross-loop readings are established.

Loop processing result is signaled by loop icon presented in each loop node in Projects window as well as in the loop's edit window icon:

Loop without any reading. All readings in the loop are disabled.

Loop is in error state. At least one enabled reading has invalid line or station.

Loop is not solved and at least one reading is enabled.

Loop is solved, but some readings remain unsolved. Most often, elevations or coordinates are missing for some stations.

All enabled readings of the loop are solved.