Apple watch

To see the map, you must turn on route tracking. On your iPhone, go to Settings > Privacy > Location Services,turn location services on then tap Apple Watch Workout, then tap While Using the App.

Then tap on maps then tap While using the app.

Then tap on System Services and turn on motion calibration and distance.

Another place to check is on the watch in settings/privacy/Location Services and make sure this is turned on and scroll down to apple watch workout and select while using the app.

Per the "Walking" section in:

Workout types on Apple Watch - Apple Support

its should be done automatically.

The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

The next steps would be to unpair and pair your watch again and restore from the backup:

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support