The remnants of a Salarian STG facility, Firebase Jade consists of two labs connected by a series of side passages and balconies. There are plenty of flanking routes to take to any position throughout the facility, which puts players at a pretty extreme disadvantage during later waves of enemies, particularly against the aggressive Reaper and Cerberus forces. Fortunately, this also means that there are plenty of ways for a squad to return the favor while staying on the move.
Upper Balcony
Players start in this area next to the Upper Lab, which has direct access to the Bridge area and provides overwatch positions for nearly every lower area of the map. If you're down in the Courtyard or Lower Balcony areas, expect the enemy to take advantage of this.
Upper Lab
The upper lab is set up like a loop with a passage through the central dividing wall, which makes it possible to hole up here during certain objective modes. There's plenty of waist-high cover to take advantage of, and if things get bad it is possible to push through back to the Upper Balcony or into the Pillar Room.
Pillar Room
One of the smaller sections on the map, the Pillar Room has two stairways leading into the Upper Lab, and another that leads to the Courtyard. This cramped location can lead to disaster for your squad when heavier opponents are on the scene.
Bridge
The smallest part of the map is directly to the right of where you begin on the Upper Balcony. Despite its size, the Bridge is a location that can help players control threats in the Courtyard, Lower Lab, and Waterfall Overlook. Of course, it's not the safest location if the enemy is closing in with a large number of troops. Beware of pincer attacks from the Waterfall Overlook and the Upper Balcony.
Waterfall Overlook
Another small location, the Waterfall Overlook feeds directly into the Lower Lab and Balcony, as well as a passage underneath the Bridge leading into the Courtyard.
Courtyard
The largest sector in Jade is also the area with some of the greatest disadvantages. Surrounded by almost every other sector and suffering from a height disadvantage which varies depending on the sector, the Courtyard connects directly to the lower level labs and the Pillar Room. There are a lot of wide-open spaces that provide little in the way of cover, an ideal situation for snipers to exploit.
Lower Balcony
This small section is right next to the Lower Lab. It has a direct overwatch down into the Courtyard.
Lower Lab
The wall that divides this area from the Lower Balcony has a break in it which allows players and enemies to pass between both sectors. This can be good for quick flanking maneuvers.
Burning Lab
The Burning Lab mostly isn't, thanks to a fire suppression system that is sprinkling the area. There is some cover that can be used here, but this is literally a corner to pin enemies down in. The Upper Balcony in particular has a series of excellent positions to snipe into this area from.