I'm using Pixhawk and added 2 GPS receivers however, only one of them is receiving signals. The first is pluged into the Serial 3 (GPS) port and the I2C port. The second is plugged into the serial 4 and 5 port. GPS_AUTO_CONFIG is set to 1. GPS_AUTO_SWITCH is set to 2. SERIAL3_BAUD is 57 and SERIAL3_PROTOCOL is 5. Same setup for serial 4 & 5. The second one works but the first does not. It has flashing lights but no sat sig. Anyone have any ideas? Thanks in advance.