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OpenTrailPaper is firmware for the LilyGO T5S3 4.7-inch e-paper board that turns it into a bike head unit: offline maps, GPX route following, FIT recording at 1 Hz and Bluetooth sensors for power and heart rate. You buy the board and a case yourself. A companion app for iPhone and Android plans routes, builds offline map tiles and moves rides off the device, but once maps are loaded the head unit rides without a phone. No account, no subscription.
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