[TXnMA]

So they are merely re-labeling the runway? In your example, the new designation would be either "13L" or "25L"...

So, when the ATC assigns the runway with that designation, the heading is corrected -- right?

[TXnMA]

I just picked up on the ten-degree convention. So the new designation in our example would be “18L”?

[screaminsunshine]

Add a 0 to the number to get the head. 19 would be 190 degrees. I think L and R designate headed N or S.