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The closest Republic quick travel point is the Dead Forest quick travel point and the closest taxi is the Dead Forest speeder point, both furthest north on the map.
The closest Imperial quick travel point is the Dead Forest quick travel point and the closest taxi is the Ossus Canyons Camps speeder point - the quicktravel is furthest north in the cluster of options and the taxi is middle-east option in the cluster of 4 options.
Ossus Mastery +6 Datacron (Both Factions)
Quicktravel: 
Taxi: 
Location: Ancient Ruins - top of a ruined platform accessed by jumping up a cliffside
Difficulty: Medium - Lots of jumping, but not dangerous to fall
Codex: Odan UrrQuick Travel / Taxi
Republic side, there is a quick travel and taxi on the same map as the entrance to the datacron.
Imperial side, there is the Dead Forest quick travel, but no taxi, if you don’t have the quick travel take the Ossus Canyons Camps speeder and the run north.
Find the Cave
Find the Secret Entrance
Inside the short cave there will be a hidden crack in the wall with some stone steps in it, which you can climb up into. Look for blue mushrooms on the wall for a hint to the path.
Climb the Steep Cave
From there, just start climbing up any way you can.
There’s really only one way to get kinda stuck, and if that happens just back track and go the other way.
Once outside, jump from the mountain to the roof of the ruins.
And get the datacron!
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