I'm about to use the GP-20U7 GPS module to connect to a Kenwood TH-D7A HT (built-in TNC)... the GP-20U7 module has four terminals (only three have cables connected, V, TX, GND).
The fourth terminal is for RX: Does that have any function in my proposed use? (The HT does have connections for GND, TX, RC)
Tips and questions relating to the GPS modules from SFE
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