GPS CACHE 1/3
Coordinates: [712454; 3416045]
Note: The gps cache you are looking for can be found after starting exploration of the location Research Base, specifically after landing in a partially flooded corridor. During crossing the mentioned corridor, look for a small ledge on the left, where Lara can climb up (reward: 5 XP).
GPS CACHE 2/3
Coordinates: [712457; 3416047]
Note: The secret you're looking for can be found right after getting to the room with a camp. Explore the right part of this room, finding a door which can be opened with the axe.
Once you open the door, jump towards the recess in front of you. Wait until Lara pulls herself up and gets to the seemingly inaccessible area.
The cache you're looking for lies on the ground (reward: 5 XP).
GPS CACHE 3/3
Coordinates: [712433; 3416055]
Note: The secret you're looking for is located on the first floor of the research facility - you can get there after solving the elevator puzzle. Before starting to explore this area, eliminate two bandits.
Once you get to the fork, turn left. Approach crates at the right wall and climb them.
Wait until Lara gets to a small area and pick up the cache (reward: 5 XP).