This is the most common way to trigger a waypoint in arma editor.
Nice and simple way to set off a waypoint. A most coolest way to use waypoint activation. All you need to remember is to name a unit that will affect a waypoint activation and a simple command that goes in a trigger condition. Cool thing is that it is applicable on all units and vehicles!
VIDEO EXAMPLE
*Create a unit and name him ( bob )*Create second unit
- give it a waypoint one with the order "MOVE" and place it closely
- give it a second waypoint to the destination where you want it to move
- in the condition of trigger put this command " !alive bob "
- synchronize the trigger with first waypoint