Compass_DEC Understanding

Hi, I would like to know what the parameter Compass_DEC does and what effects it has if this value is not set in an RC boat.
What is the correct way to adjust this ?.
Is it mandatory to set this parameter?

Thank you for your help, this forum is great

I have always used COMPASS_AUTODEC with good results. It’s to adjust the compass based on where in the world you are at the time.

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I think auto declination is highly reliable unless you’ve got some unique magnetic anomaly in your area.

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Thanks @all !
Great !!
I didn’t see Compass_autodec :slight_smile: