Calibrate the compass on iPhone 7?

Hi Alex, I appreciate the speedy response, but what you wrote doesn't respond to my question, nor does it provide helpful advice. I think you're trying to say:

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The Compass app in the iPhone 7 does not need any calibration.

Whenever you use the Compass, be sure to avoid external magnets because they can affect the reading. As the article Use the compass on iPhone - Apple Support states:

"Important: The accuracy of the compass can be affected by magnetic or environmental interference; even the magnets in the iPhone EarPods can cause a deviation. Use the digital compass only for basic navigation assistance. Don’t rely on it to determine precise location, proximity, distance, or direction."

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Is this a good summary of the answer? Many thanks.

That's helpful. I was astonished to see how far off the compass was (90 degrees out of whack) some times. But now it's correct. I wonder if I was carrying something magnetic when I was having trouble. (This is grist for more experimentation.) Thanks.