Hi Thomas, yes, I also thought about something like that. I still have to learn some details of the gmapi format and the generated files and dependencies between them. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Thomas Morgenstern <webmaster@img2ms.de> Gesendet: Montag, 13. September 2021 18:01 An: Development list for mkgmap Betreff: [mkgmap-dev] mkgmap doing excessive writing I suggest the new option should be named reuse=<comma separated list of files, wildcards enabled>. exampel reuse=40000001.img, 40005*.img. If this option is used, then mkgmap should not overwrite the listed folders in the <name>gmap. Naturally mkgmap should write a new tdb, preview.img, mdr and idx. In most cases the reuse folders contains Contourlines or other static content. Thomas