Abstract: Emergency workers and other personnel are often endangered by losing contact with other personnel, for example, firefighters working in hostile conditions. Methods and devices for improving the survivability and reducing the potential for injury or death of emergency personnel and others are provided. The methods and devices monitor the distance of members of a group to, among other things, minimize or prevent personnel from being separated from the group. Devices worn by members of a group monitor the distance between members by monitoring the characteristics of wireless communication, for example, signal strength, between members. If the distance between members exceeds or is less than a predetermined distance, an alarm is sounded to alert members to the potential for contact between members or loss of a member of the group.