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===== BACKUP GPS UNIT =====

As a backup in case my GPS transmitter fails for any reason, I have one of these:

{{projects:earthshine:real_time_triband_handy_gps_personal_tracker_with_sms_message_01_48958.jpg?200}}

It is a GPS Tracker fitted with GSM technology. It has been fitted with a Virgin Mobile sim card and set to automatically send an SMS message containing it's GPS co-ordinates every 5 minutes. It will sit in the payload and once the altitude drops below 60,000 feet and it comes within range of a GSM cell, will start sending SMS messages, at 5 minute intervals, containing the payloads current location. In the event of the main GPS/Transmitter system failing this should act as a backup system to allow the landing spot of the payload to be found and for the recovery team to locate it.