I've recalibrated the triangulation device with the information that you provided from the first point.  You'll use it in exactly the same manner to discover the second.$B$BAll that I can tell you is that the second point is somewhere far to the west.$B$BOnce you've located it, speak with Wind Trader Tuluman; another of the nexus-prince's agents.  He's posing as a weapon merchant at a small trading post next to the bridge, which leads to the island that Manaforge Ara is on.