Forum search didnt bring back and hard strings for me. Been staring at the book game map (book division and small print with my aging eyes). And I have been online and I dont see Gavos from the Debts to Pay module. Thought I did but thats Garos I think. Based on Oridium and what little infoonline there is, I say its somewhere around Yavin? As the Empire works on the Phantom Tie fighter with Oridium?

A little research turned up the following:

The Arah system is in the Dantus Sector in the J-6 grid. This puts it near Troska and Cirrus, and on the edge of wild space in the outer rim, roughly a quarter of the galaxy spinward of Yavin.

Thanks Hydrospanner!