GPS + external Magnetometer

Hello,
I want to use an external magnetometer next to a GPS module.
So far I was planning to connect the GPS module to the GPS1 port on my Pixhawk 6x and the magnetometer to a I2C port or to also to the GPS1 port by using only the I2C busses.
What do you recommend?

Connect the external Compass to the GPS1 port by using only the I2C bus of the GPS1 port.

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