Hi Andrzej, thanks for the hints, I've changed the description of the option a little bit but kept the java code for r3764. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Freitag, 20. Januar 2017 11:40:50 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] [Patch] set map-version in img header Hi Gerd, I call these values TRE parameters. They are 3 bytes at offsets 0x43, 0x44, 0x45. I'm not sure, what is the real meaning of parameters. Same guesses are that it indicate routable/non routable map, general display priority, some parameters for navigation, general map type. Info about faster routing probably comes form cgpsmapper. Table on OSM wiki looks wrong. Byte 0x40 is priority, I don't know if 3 byte is used, single byte works for me. Beside this priority, TRE parameters influence priority too, but differently on different GPS. It is like some GPS display City Navigator map over topo, regardless of draw priority in byte 0x40. On Garmin maps byte 0x43 gets values 0 or 1, Byte 0x44 gets values 3-4-6, byte 0x45 some values in range 1-43. Wiki shows it in reversed order. Last byte decide if map is visible in chartplotters, so probably define map type. My idea is simply to copy values from original Garmin's map. So now mkgmap is using City Navigator parameters and option sets custom MPC map ( https://developer.garmin.com/map-product-creator/overview/ ). You could set 3 values in option directly, but I'm not sure if it will help. Probably anybody who want to manipulate these values is able to use GMapTool or other patching programs to change it in img. -- Best regards, Andrzej _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev