To the naked eye, the Apple Watch Series 5 isn’t much better than its predecessor, the Series 4. It looks identical, aside from the Series 5’s always-on display. It’s pretty similar under the hood as well. The Series 5 has a few expected upgrades, such as a newer faster processor and more storage, but it has essentially the same combination of sensors and can track mostly the same metrics as the Series 4.

The one big internal difference is that the Series 5 has a built-in magnetometer. This enables an all-new Compass app, which no other previous Apple Watch has, and it can help you tell which direction that you’re facing just by looking down at your wrist. The new sensor also enriches the experience of using other apps, besides the Compass, on the Series 5.
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https://gearpatrol.com/2019/12/05/best-apple-watch-apps-compass/