[mkgmap-dev] TRE value 4 -- maybe related to intertile routing?

Sat May 1 10:52:54 BST 2010

Where is TRE4 set in mkgmap?

I know that TRE values 1-3 are set here:
uk/me/parabola/imgfmt/app/trergn/TREHeader.java

writer.put3(displayPriority);
writer.putInt(0x*110301*);

However there is a fourth value which in most Garmin maps is 0xd, 
whereas we use 0xc.
If I use gmaptool to adjust it to any uneven number (like the Garmin 
default 0xd) then routing does not work at all anymore. But Garmin maps 
use this value. Therefore I would like to try out what happens if we use 
mkgmap to directly set the fourth TRE value to different numbers, but I 
can't find it in the sourcecode.
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