I'm sure a lot of you are aware of this, but just wanted to share with the minority that may not.
If you don't want to search up a destination via Siri on your Apple Watch, you can use the Apple Maps app on your phone, start the navigation and this will automatically be synced to your Apple Watch so you can put your phone away. I was stupid and thought this function was broken, but turned out I was using Google Maps on the phone, but once I switched over to Apple Maps, all is good!
If you don't want to search up a destination via Siri on your Apple Watch, you can use the Apple Maps app on your phone, start the navigation and this will automatically be synced to your Apple Watch so you can put your phone away. I was stupid and thought this function was broken, but turned out I was using Google Maps on the phone, but once I switched over to Apple Maps, all is good!