Hi Frank, Yes I meant new.tdb, I have changed a lot of file names and paths to check where this error came from 😉 It seems to work now! With the fixed tdb I can now send maps from the computer to the GPS without errors. I'll check the maps further, will report it when I find something. Thanks for your work! ________________________________ Van: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> namens Frank Stinner <frank.stinner@leipzig.de> Verzonden: vrijdag 1 december 2017 03:36:45 Aan: mkgmap-dev@lists.mkgmap.org.uk Onderwerp: Re: [mkgmap-dev] gmtool and TDB Hi, i hope, the error message was "unbekanntes Argument: new.tdb". It's a stupid error from me in the description: please change from "--mapsource=new.tdb; ..." to "--mapsource=tdb:new.tdb; ...". The dot after -i means the actual working directory. If you start gmtool in directory "g:\mkgmap\Openfietsmap\versions\test\Openfietsmap (BNL).gmap\Product1" this is ok. Then you also don't need the full path for your old TDB. -o defined the output path, in this case only for the new TDB. Frank