Note as I cant get the book till october. I can only go off what is said. So I apologise for any errors.



"X.X1121.4" Is very likely to be a local terminal node. Presumably linked to a Forerunner location. The Ark I guess.



The Catalog that used to post here used a similar code "X.E8" to connect to the Forerunner site "Edom Terminal\Juridical" on/near Mars. Hence why I think this.



The latter half of the code is presumably position and navigation codes. Something we havent seen before. :/ So I cant really comment.