sparkfun ZED-F9P Hook-Up Manual page 14

Low-cost magnetic GPS/GNSS antennas can be used (checkout the u-blox white paper) but a 4" / 10cm metal
disc is required to be placed under the antenna as a metal ground plane.
LEDs
The board includes five status LEDs as indicated in the image below.
PPS: The pulse per second LED will illuminate each second once a position lock has been achieved.
GEO: The GEO LED can be configured to turn on/off for geofencing applications.
RTK: The RTK LED will be illuminated constantly upon power up. Once RTCM data has been successfully
received it will begin to blink. This is a good way to see if the ZED-F9P is getting RTCM from various
sources. Once an RTK fix is obtained, the LED will turn off.
VIN: The VIN LED will illuminate when there is voltage applied to the VIN pin or over USB.
3V3: The power LED will illuminate when 3.3V is activated either over USB or via the Qwiic bus.