Enrolling someone in a Silver Alert program puts their name and information into a database. If an emergency occurs, the profile is then sent to local police stations or broadcast to the public. In Phoenix, for example, Silver Alerts are broadcast onto official highway message signs. Not every state offers this type of program, but if offered, it is definitely an advantage.
Beyond Silver Alerts, there are new technologies constantly emerging to help wanderers return home more quickly. There are bracelets, tennis shoes, long-range medical alert necklaces, and more that all have GPS tracking devices in them. These technologies are not to replace actual human monitoring, but can provide a little bit of extra help in the worst-case scenario. If someone truly becomes lost, a GPS device can be a lifesaver.