It can take many hours to surmise that someone has been kidnapped. Getting people to pay direct attention to someone's whereabouts, without having to constantly nag the person, is a huge win.
Anyone who has ever expected an at-risk person to make contact at an estimated time can relate how worrying it is when that person is delayed.
Anyone who has ever expected an at-risk person to make contact at an estimated time can relate how worrying it is when that person is delayed.