MAO is a star with an associated star system in the space of the galaxy's Alpha or Beta Quadrants. The MAO system's orbit was the location of a number of planets, including third planet MAO III.
According to Starfleet Intelligence outpost maps, this system's coordinates are 4.91N 2.34W, placing it in the Starfleet Intelligence sector 1. (FASA RPG module: Star Fleet Intelligence Manual)
This system was in the general vicinity of the Spica and Antares systems. (FASA RPG module: Trader Captains and Merchant Princes)