Hi Andrzej, changing the TRE bounds helps sometimes, but not always :-( @Frank: All Garmin TRE files that I looked at where aligned to multiples of 4 map units. I tried this as well as aligning to multiples of 2, nothing worked without crashes so far. Anyhow, it seems to be the right thing to look at. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Dienstag, 6. Februar 2018 15:49 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] Garmin uses overlapping tiles Hi Gerd, I guess basemap is overview map. 0x4A objects are derived form backgrounds of detailed tiles, but with resolution of overview map, it would be difficult to guess, if background overlap or not. I hope extending values written to TRE will work. -- Best regards, Andrzej _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev