Voss Datacron Locations
There are 5 Datacrons on Voss. Special thanks to Beefcake on Darth Malak server for helping me to locate these.
Datacron 1 - Republic and Empire
Codex Entry - Galactic History 77: A Return to the Unknown Regions
The first Datacron is located in a valley right beside Voss-Ka. It looks like you can drop down into the valley from Voss-Ka to get it, but you cannot. In order to reach it you have to take a taxi to Ken-La Outpost (Republic) or Fort Kodentha (Empire). From there travel down to the southeast corner of the area. The path up the mountain starts at -442, 405. Start climbing the rocks at -436, 185 to reach the cave entrance. The cave entrance is at -385, 134. Go through the cave, and when you emerge you will see the Datacron.
Corrdinates: -29, 372
Datacron 2 - Republic and Empire
Codex Entry - Galactic History 73: The Battle of Malachor Five
The second Datacron is located in The Old Paths at the Shrine of Healing. You have to complete the Trials quest line at the Shrine of Healing to be able to meditate at the Datacron and unlock it. For Republic the quest line starts at Suva-Rak at Pilgrim Retreat (-1770, -854) with the quest "Roadblock." For Empire the quest line starts at Fadith-Ki at Pilgrim Retreat (-1788, -893) with the quest "The Gormak Problem." After you have completed the quest line, use the green crystal in the northeast corner of the Datacron room. After that go to the center of the room, and you will be able to use the Datacron.
Coordinates: -1948, -2228
Datacron 3 - Republic and Empire
Codex Entry - Galactic History 76: Revan is Remade
The third Datacron is located in The Gormak Lands. The closest Empire taxi is Outpost Skyline. The closest Republic taxi is. The Datacron is in the southeast corner of the map, in a small enclosed area. The path to it starts at 468, 1948. Fight your way along the path to the clearing with the Datacron. At the end of the path, its hidden behind a tall stone. You can't miss it.
Coordinates: 654, 2050
Datacron 4 - Republic and Empire
Codex Entry - Galactic History 74: Revan and Malak Fall
The fourth Datacron is located in The Nightmare Lands in The Boneyard heroic area. First you have to get a Shield Decoder off of a body laying beside a destroyed walker. The body’s is located at 443, 206. After you get the Shield Decoder, near there is a concrete area with a red force field on the ground. Use one of the terminals to lower the force field. Then the circle area in the center will lower you down to the Datacron.
Coordinates: 514, 175
Datacron 5 - Republic and Empire
Codex Entry - Galactic History 75: The Jedi Civil War
The final Datacron is located at in the northeast corner of The Nightmare Lands. You have to use a meditation tablet to enter the Spirit World. The meditation tablet is located at 2002, -942 in the middle of a shallow lake. The meditation tablet sits on a stone altar, and it not guarded. Just walk up and click it. Once you use the tablet and enter the spirit world, the Datacron is in the center of the room. To get out after you get the Datacron, just go back to the spot where you entered the spirit world at, and use the tablet again.
Coordinates: 2143, -840