Dromund Kaas Datacron Locations
Coordinates: X: 855, Y: 643
This Datacron is located in Docking Bay D-61 of the spaceport of which you arrive in when you first reach Dromund Kaas. To get here you'll want to take the ramp up the right side of the room and at the top you'll see a small space next to the wall where you can drop down to a ventilation pipe. Drop down to the ventilation pipe and walk along it until you reach the Datacron at the end of the pipe.
Note: Just drop off the pipe, don't jump or you'll overshoot where you need to land.
Coordinates: X: 581, Y: 798
Immediately exiting the Dromund Kaas spaceport you will be able to go up a path to the left which will lead you to this Datacron. It's literally that easy.
Coordinates: X: -1219, Y: 209
Located in the Dark Temple Approach part of Dromund Kaas. To reach this Datacron you will need to go to -1087 , 214 and jump up ontop of some boxes to get to the path that leads you directly to this Datacron.
Yellow Matrix Shard
Coordinates: X: -187, Y: 1738
Located in southern Dromund Kaas at the Malignant Bog sitting ontop of rocks which go overtop a Waterfall. To reach this waterfall you will want to go to the left of it and follow a path up to the area behind the waterfall. From there the rest is easy.
Coordinates: X: -793, Y: 1450
A narrow path near the western portion of Lord Grathan's Estate leads to this Datacron. This is another extremely easy one to get, it shouldn't give you much trouble at all.