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InfluxDB
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For the second point, it's possible to receive & decode the position locally using a handheld radio that can receive 144.390 MHz & a cell phone running APRSdroid. Do note that not all handheld radios will work for this. I learned the hard way that the Baofeng UV-5R does some kind of processing on the signal before passing it on to the phone which won't allow the app to work correctly.
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