Traveller - Converting T4 to Mongoose 1/2 or Cepheus

Most of the adventures published by BITS were written when Marc Miller's Traveller (T4) was the current edition of the game. BITS always included a universal conversion table for task rolls, but the characters were firmly built in T4 or GURPS Traveller.

Back in 2020, I shared a conversion sheet to allow you to map T4 skills to Mongoose Traveller. I've just gone back through it, and the mappings are now in for T4 to Mongoose Traveller 1e (and by implication Cepheus) and Mongoose Traveller 2e (I've checked the 2017 and 2022 skills for this).

There's also a suggested conversion map for skill level as T4 tended to be a skill heavy system, and Mongoose less so.

You can find the updated sheet here.

If you spot any mistakes, feel free to let me know.

Of course, the reason I'm looking at this is that I'm working on a project to get the BITS adventures back out and available once more.

22 June 2025