Some beta testers and I tested this application for a long time. I believe that the results are relatively error free. But I can't give you any guarantee that your positions are correct. Be careful with the output and, like all good navigators, use common sense and always cross-check your position by other methods and systems.
Use the software at your own risk. The software is provided on an 'as is' and 'as available' basis without warranty of any kind.
Map data from OpenStreetMap, Licence is CC-BY-SA
This product was developed using parts of GEOTRANS, a product of the National Geospatial-Intelligence Agency (NGA) and U.S. Army Engineering Research and Development Center.