From Dave Akerman:
This is an update of a previous post, but post-flight (so I know that it works!) and with instructions on how to make your own tracker, and your own gateway to upload to the live HAB map.
Introduction
GSM-based trackers are quite rightly frowned upon for HAB tracking, mainly because they only work at low altitudes (within range of a mobile phone tower, which aim the signal generally downwards). So they don’t provide tracking throughout a flight, which is a problem as then you don’t know where the payload is until it lands.
If you’re lucky.
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