World Origin Height

[Tony_Howard]

I have found 2 routes that I would like to merge. One has world origin set to 0 at sea level so that's fine. The other one, even though it is set to 0, the whole route seems to be based on a sea level height of -80. Hence trying to merge, there is a height difference of 80 meters at the join. I have tried changing the altitude in the config file world origin, but this just seems to change the terrain height, but does not alter any track or spline heights. Does anyone know of any way to address this ?

Thanks

Tony