>> This is the point which confuses me at the moment. This bit does 
>> influence routing in some way. But you say that there are nonroutable 
>> maps with this bit set/unset. So what could the meaning of this bit be?
>>     
> Noone really knows. Mkgmap sets it even. Garmin maps are actually 
> allways uneven. I speculated that the 0 (unset) here breaks intertile 
> routing, but I have no clue what mkgmap is doing here and where to set it.
>   
In the TREHeader.java (like in the patch from steve) add a one more byte 
in first position. If I understand it correctly, this will set the 
ominous fourth byte to 01. (Not tested).

-               writer.putInt(0x110301);
+               writer.putInt(0x01110301);

> [...] mkgmap default: -1 - 3 - 17 - 0
>   
This are exactly the values from the line above, in decimal coding. (The 
values in mkgmap are in hexadecimal coding.)

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