A possible way to find the flag: With MapSource (at least with 6.13) it is possible to include or exclude the routing data when transferring to the device. If you transfer the same data twice, one time with, the ther time without the routing data,
A great idea!
Unfortunately my results are that all the sub-files are unaltered and bit for bit identical in the two cases.
All the changes in the header appear to be consistent with the changes required for the fact that the files are different sizes and one does not contain NOD.
Ok, so there IS NO NOD flag. I really haven't expected this result, but seems the case here.
I've had no luck with finding anything. I've tried unsetting all the flags that we don't know the meaning of, so it seems that it might not be a simple flag that we always set but shouldn't.
Two things come to my mind. 1. Could it be a matter of draw priority? Maybe the routable map needs a higher drawing priority to be in front? In the other case routing will be tried on the non-routable map and fail. 2. Could it have to do something with the detailed map/basemap flag? To write a patch for this bit should not be that complicated, but iirc setting this bit breaks routing. Regards, Johann