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787 Well if you have no choice because you are out of spare full UARTs then you just have to accept the cons of doing that. It will still work, but you might have to pre-configure some things on the GPS module using ublox u-center because Betaflight won't be able to do it for you automatically. It's the same with receivers. You can just connect the TX pad of the receiver to the RX pad of the FC if you wish, but you just won't get any FC telemetry data back to the transmitter if you do that.