Compass not moving on iPhone 11

Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.

1. Restart the device. That's it.
2. Still not solved --> Force restart iPhone - Apple Support

Try going to settings on phone. Privacy and Security then Location. Look for the Compass and change to 'only when I'm using the app' or toggle Compass off.

Also open the Apple watch app on your iPhone. Tap on the My Watch tab at the bottom of the screen. Scroll down and tap on General, then Watch Settings. Locate the Connectivity section and toggle off the Compass switch.