diff --git a/boards/px4/fmu-v6x/init/rc.board_sensors b/boards/px4/fmu-v6x/init/rc.board_sensors
index 4285cab6790..92c09372e0e 100644
--- a/boards/px4/fmu-v6x/init/rc.board_sensors
+++ b/boards/px4/fmu-v6x/init/rc.board_sensors
@@ -21,6 +21,9 @@ icm20649 -R 14 -s start
 # Internal magnetometer on I2c
 bmm150 -I start
 
+# External compass on GPS1/I2C1 (the 3rd external bus): standard Holybro Pixhawk 4 or CUAV V5 GPS/compass puck (with lights, safety button, and buzzer)
+ist8310 -X -b 1 -R 10 start
+
 # Possible internal Baro
 bmp388 -I -a 0x77 start