Secure Area
You secure a perimeter and set up camp for subsequent operations by shoring up weak positions, clearing out sight lines to vulnerable positions, and the like.
Activity
You spend the day securing a 50-foot-by-50-foot area over which you and your allies have control. As part of this activity, you can attempt Engineering checks to arm up to eight explosives that you own. You can set the triggering methods for these detonators to be rudimentary trip wires or pressure plates; in this case, each explosive requires its own detonator. The DC of Perception checks to notice these explosives is equal to the result of your Engineering checks to arm them. You can’t take 20 on these checks.
Results
On the following day, you and your allies gain a +2 circumstance bonus to initiative and Perception checks in the secured area.
Multiday
-Special
-Source
Character Operations Manual pg. 155