A lightweight, low-cost system for each firefighter to detect the location and direction of other nearby firefighters will be provided. A heads-up display will allow hands-free operation. The system will be integrated with the Personnel Ultrasonic Locating and Safety Equipment, or PULSE, developed by Summit Safety. This system uses ultrasound -- sound waves above the normal hearing range -- to enable a firefighter or Rapid Intervention Team (RIT) to quickly locate and rescue a disabled firefighter and to quickly locate exits in dense smoke. COMMERCIAL APPLICATIONS: The total US market for this product includes the over one million firefighters in over 26,000 fire departments, military firefighters, police departments (including SWAT personnel), and Search and Rescue personnel (such as FEMA teams). The total US market is estimated to be in excess of $200 million