My Garmin contains a magnetic compass and can display your ABCs (altitude, barometer, compass) on the watchface or widget. You can also query the compass using

My Garmin contains a magnetic compass and can display your ABCs (altitude, barometer, compass) on the watchface or widget. You can also query the compass using the API: https://developer.garmin.com/connect-iq/sdk/ https://developer.garmin.com/connect-iq/sdk/ and issue alerts using the built-in vibration motor; it would be pretty easy to build a Connect app to do this.