Outlands Spur

Symbol #1: Head to the central part of the map and locate the Air Dome Generator on the ground level. Find the nearby "H-shaped" structure, stand on it, and face east. Look for a Dahl sign; to its right is a horizontally striped container where the symbol is found on the north side, near the ground.

Symbol #2: Go to the Pumping Station in the southwest corner of the map. Proceed to the west end and use the jump pad to reach the next level. Use the subsequent jump pad to get on top of the walkway above the Air Dome Generator. Focus on the western tower. On its north side, you'll find a ledge. Jump onto this ledge and look at the tower to find the vault symbol.

Symbol #3: This symbol is in the southeast corner of the map, an area you'll visit during the optional mission "Nothing is Never an Option." Locate a lone building; the vault symbol is on its south side.

Symbol #4: Proceed to the northwest compound and enter it. Go towards the covered tunnel straight ahead, continuing to the far back of the compound along the same path indicated on your map. The vault symbol is on a wall at the north end.