Localization using the NonLinLoc method is invoked from the menu with the Localization 
NonLinLoc command. A window (Fig. 13) appears for estimating the location based on the times of seismic waves.
Fig. 13. NonLinLoc locator window.
The Compute button starts the location of the earthquake based on the selected seismic phases. Result added to the list of locations for the event. In the case of NLL, there will be an annotation describing the calculation method in the elaboration window: EDT_OT_WT. The Recompute button already recalculates the given location. The old NLL location will be replaced if it was calculated with the same method (see LOCMETH - NLL calculation methods at http://alomax.free.fr/nlloc/) and the same speed model was used for the calculation. Compute always counts the 3D location. If the depth is set during the localization, it should be set in the Z window, select Fixed depth and click Recompute. This can only be done when the location search method in the NonLinLoc LOCSEARCH parameters is set.