A few days ago, people noticed that Apple had put a warning on its website: Certain bands could affect the accuracy of the new compass feature in the Apple Watch Series 5.
Believe it or not, Apple cannot defy the laws of physics, and as such a magnetic clasp is at risk of interfering with the compass in its smartwatch.
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We got some clarification from Apple on this. The problem arises with Apple's Leather Loop, Milanese Loop, and Modern Buckle bands. It also applies to earlier Sport Loop bands, which contained magnetic materials.
However all the Sport Loop bands introduced this month won't actually pose a risk. Apple's given that lineup a refresh, and tweaked it so that it no longer has a potential effect on the compass.
It's also something to also be aware of if you're buying third-party bands. If that's you, and you care about upmost accuracy of the compass, make sure there's no magnetic component inside.
If you're buying an Apple Watch Series 5, you'll also be able to see the above information at the bottom of the compass app by scrolling down and navigating to Apple's support page.
At least with the Series 5, Apple is finally letting you pair different watches and bands at the point of purchase, rather than having to buy additional bands separately.