Hello, I am using a GPS shield with an arduino Mega2560, not mounted on the board because it doesn't fit completely, but wired to the power (5V, 3.3V and GND), and the pin2 connected to the pin15 (RX3) of the Mega2560 with the UART/DLINE switch set to DLINE(indifferently, when I connect it to the RX…

EM406 providing strange readings

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