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How to configure and use GPS

Enable power

power on:

echo 0 >/sys/devices/virtual/gpio/gpio145/value
echo 1 >/sys/devices/virtual/gpio/gpio145/value

read device file (use 9600 baud!)

stty 9600 </dev/ttyS1
cat /dev/ttyS1

If you don't see NMEA records coming every second, give another reset impulse (each impulse appears to toggle between standby and active).

if the external antenna is active can be determined through

cat /sys/devices/virtual/gpio/gpio144/value  # 1=ext. ant.