BerryGPS uses the serial port on the Raspberry Pi. By default, the serial port is already assigned to the console. This can be confirmed by using; pi@raspberrypi ~ $ dmesg | grep tty [ 0.001609] console [tty1] enabled [ 0.092061] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2 … Continue reading BerryGPS setup Guide for Raspberry Pi