This Datacron is on Savrip Island, a Heroic area. It’s fairly easy to get.
Take the Taxi or Quicktravel to Volcano Camp
As a Trooper, if you pick up the Heroics all three will dump you straight on the island where the datacron is.
The closest Republic quick travel point is the Volcano Camp or Oradam Village quick travel point (in the top left / north west on the map) and the closest taxi point is the Volcano Camp Speeder or Oradam Village Speeder speeder point (in the top left / north west on the map).
Run to Savrip Island
Run or take your speeder to the island in the north west. You can easily see it on your map if you press M on your keyboard for map. You will see it once you enter the island as a blue light shining from the mountain top.
4. Climb the Mountain
There are multiple ways up, but the easiest is to go to the west side of the island and run up the hill and then cross the rock bridge.
Across the rock bridge just climb to the top of the mountain!