These are all located on the world map between the bases where you are driving the Hammerhead vehicle. They are yellow circles with barrels in the middle of them that you scan by pressing the Y button. The location are as follows:
1. Just outside of the entrance to Vulcan station near some prefab structures.
2. Beneath the land bridge leading to Vulcan station near a small crashed vehicle and a pair of defending YMIR mechs.
3. A path leads up through the mountain just before you turn left on the land bridge to go to Vulcan station. Follow this to another group of prefab structures guarded by 2 cerberus cannons.
4. Continue around the mountain from #3 until the path splits off to the left and take that to another raised structure with 2 cerberus cannons.
5. Behind a waterfall near the path to Prometheus station and up a small ramp is another undefended data packet.
6. A cave/tunnel near Hermes station's location (take a sharp right when exiting Hermes) with 2 cerberus cannons at another set of prefab structures.
Just keep your distance from the enemies and duck behind cover when your Hammerhead's alarm starts going off and you shouldn't have to hard of a time with this.