Go to (718, 1860). There is a large rock with a dirt path just to the right of it. Run around the rock and follow the path past the back through the rocks, past the "Aging Bormu", to the Datacron.
First go to the vendor directly south of Tarlarn Outpost and buy the MGGS. Then, go to the Larantha Dam @ (2164, -1992). The Datacron is half-way down the front of the dam and visible as you approach ...