I think it was The Traveller Adventure where they first introduced the idea of a secret Imperial J6 courier network.

Joe Hoopman

On Apr 10  2019 at 22:38 Bruce Johnson <xxxxxx@pharmacy.arizona.edu> wrote:

Yes, I believe that was MT or TNE -era updates. I remember reading about it in Survival Margin which kind of bridges those two.

It might be possible to use the data from the Traveller Maps site to map the propagation of information along the XBoat routes between any two points.