Why Spaced Based System

Following are the reasons that led to space based system:

• Detection dependent on aircraft over-flight
• Chance of survival decreases significantly with time
• Search area limited: dependent on altitude of aircraft 
• No location capability.
• Cost of rescue increases significantly with size of search area
• Designed for audio detection by Over-flying aircraft, no global monitoring.
• No identification of beacon/user
• Large number of false alerts