Is it compulsory to have external compass?

Hello everyone, I have a question: I noticed that almost all the GPS hardware based on F9P do not have integrated compass. Then does it mean I need to connect another external compass with the Pixhawk ?
Is it compulsory to have external compass as I noticed the Pixhawk has an internal compass already?

Best regards, Mirko

not at all

It is just that in most cases you will get a much more reliable compass reading if it is well away from metal and high current stuff, hence the GPS is a handy place for it.

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I would say it is compulsory to have any good compass readings. Internal compass is just unusable in most cases due to EMI.