compatible compass


I have a pixhawk with internal compass + external GPS M8N with compass. There are to high interferences on internal so I use external compass as primary. But now I would like to have backup compass. There is a option for 3rd compass in Mission Planner. What are options for me ?

What type of compass are supported ?

I suppose in the GPS is HMC5983 so I can not use it twice on I2C.

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