An example how you can use trigger to start a random patrol in Arma 3. In this case I was using trigger ( Civilian detected by Blufor ).
VIDEO EXAMPLE
*Create a group
- Assign a name for that group ( for team leader ) - lets call them "GrpName"
- in ON ACT field put this " nul=[group GrpName, position GrpName, 100] call BIS_fnc_taskPatrol; "
- in trigger options select Civilian detected by Blufor
Create Civilian