If nothing is known a priori, then the number of degrees of freedom are zero. There are only three variable DATA file arguments that the user can change to control the direction of the solution. All three are related to selecting an initial hypocentral location. An invalid value will result in dblocsat2 determining its own initial location, internally. Latitudes are positive north of the equator.
Longitudes are positive east of the Greenwich meridian.
Depths are positive below a datum of sea level. The addition of source-specific station corrections is currently under development, and not implemented in the present version. A set of test files is provided in directory, tst, found within the main dblocsat2 source code directory.