Use map zones my friend. Wherever you want to have your patrols use the hand icon and right click and you can set the map zones. Enter the area radius and set your waypoints to enter the zone. In the trigger menu name it like 'entered message zone'. Choose message in the box and type out what you want the message to say. In another box you'll see a drop down listing. Choose Patrol Area and set the time for 1 minute. Choose how you want to receive your message, either continous or vital. Hope this helps. At least it worked for me.
Cheerio!
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