input (rx) and output (tx) are only 2 pins, so if the wind sensor sends only - you can use your tx pin of the interface for another device (here: send gps data). otherwisew autoplotters normaly use both directions - so their interface is fully used, no spare pin.
holger
One problem with this double use is this: you have to use the SAME Baudrate (frequency) for BOTH devices !
holger
One problem with this double use is this: you have to use the SAME Baudrate (frequency) for BOTH devices !