Hi
It seems that mkgmap writes some constants that might be important, e.g. MapDetailBlock.java contains //01 c3 00 ff os.write4(0xff00c301); os.write(0); os.write(0); os.write(0);
I've just looked at this. No idea where any of those came from :) I think those 7 bytes should be: 1 byte: unknown to me 1 byte: Maybe index into block 'S' (0x53) 1 byte: index into block 'R' (0x52) or zero if no block 'R' 4 bytes: a size that is generally related to the size of the file. cgpsmapper and gmaptool set this size to 256 (and previously to 255) Block R has the following structure: 1 byte: index number, starting from 1 n bytes: zero terminated string There is probably only ever one of these. Eg "Europe guide v1" Gmaptool appears to create one of these with the name "All". Block S has the following structure: 1 byte: number, probably index into block R 1 byte: number index in this block, starting from 1 n bytes: zero terminated string name eg: 1,1 "Region 1 - Aus/Switz/N.Italy" 1,2 "Region 2 - France" 1,3 "Region 3 - Germany/Czech Republic" ... Unfortunately I think they have nothing to do with DEM as maps without DEM have these. There are lots of unknown entries in the TDB header, there could be something there. ..Steve