Hi Carlos, not sure if I understand what you want to achive. The file mapset.mp contains only a few rectangles for the tiles in the map, it typically contains no map data. So, there is nothing to display. If you compute the map tiles with mkgmap you can also compute an overview map. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Carlos BJ <carlos2004@gmail.com> Gesendet: Sonntag, 26. Dezember 2021 00:52 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] blank zoom levels - how to avoid? Bear my slight knowledge of map formats and mkgmap... Besides, I do not know where other place to write to ask for help... Tried to find answers in the documentation but could not. I have an IMG file that wish to "cut" to an specific region. My best choice is to do it using Basecamp. So, I need to be able to load the map in Basecamp. I do it using GMaptool. Select the starting IMG, In Split I select files for mapsource, compile preview map, create tdb v3 if possible. GMaptools makes its magic, then calls mkgmap using: "java -jar "C:\folder\mkgmap.jar" --no-tdbfile --mapname=29067263 --output-dir="G:/Outfolder" "G:/Workfolder/mapset.mp"" Now, I can instal the map and basecamp can show it.... but.... a watermark with "Gmaptool preview" can be seen at the lowest left corner - not an issue no contents is shown at 500km zoom, neither 300, 200, 150, 100, nor 70; then, at 50kms, all is shown So, I am ready to run from CMD the command "java -jar "C:\folder\mkgmap.jar" --no-tdbfile --mapname=29067263 --output-dir="G:/Outfolder" "G:/Workfolder/mapset.mp"" but ... what can I change so that all content is shown from the 500kms scale? 50kms is too close to be workable .... TIA _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev