Pixhawk 1 Mag 3 calibration

I wanted to calibrate the compass on my Pixhawk 1 equiped machine in Mission Planner.
While tilting the drone during calibration I noticed that Mag 1 and 2 show progress while Mag 3 doesn’t.
Mag 3 also doesn’t show in the “Compass Priority” section.

Does compass 3 exist on Pixhawk 1 ?
If not, should I uncheck “Use Compass 3” ?

No. There is 1 internal one and you have 1 external one.

Should I uncheck then “Use Compass 3” ?

Doesn’t matter but why not if you don’t have one?

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