# mRo u-Blox ZED-F9 RTK L1/L2 GPS + external magnetometer hookup

Source: https://forum.modalai.com/topic/3749/mro-u-blox-zed-f9-rtk-l1-l2-gps-external-magnetometer-hookup
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2024-08-29 03:45:04 UTC by jon
Replies: 1 · Views: 474

## jon · 2024-08-29 03:45:04 UTC

Hi, 

We are trying to hook up an mRo u-Blox ZED-F9 RTK L1/L2 GPS, which doesn't have a compass, alongside an external magnetometer with a QMC5883L chip. I read in another thread that chip is directly supported. Should we just be able to wire in the SCL and SDA pins from the mag, and PX4 should automatically recognize it? Or are there external drivers we need to add to the build? We tried it with an adafruit magnetometer + accelerometer unit and it wasn't recognized, but I'm not sure which chip it had or whether there were drivers for it (probably not). 

Thanks

## Reply by Eric Katzfey (ModalAI staff) · 2024-08-29 15:45:46 UTC

@jonathankampia Yes, both qmc5883l and ist8310 are supported now.