When Activation Lock is turned on, your Apple ID and password are required to unpair your Apple Watch from your iPhone, pair your Apple Watch with a new iPhone, and turn off the Find My iPhone feature on your Watch.
What to do if you don't see your Apple Watch on the mapIf you're not seeing your Apple Watch on Find My iPhone, it may not be connected to Wi-Fi, cellular data, or your paired iPhone.
If you didn't turn on Find My iPhone prior to having your Apple Watch lost or stolen and your Watch has no means of communicating with the app via a Wi-Fi connection, cellular data, or your paired iPhone, you cannot use it to locate your Watch.
To protect your information, put your Apple Watch in Lost Mode by tapping Actions, then Lost Mode in the Find My iPhone app.
To see if Find My iPhone is already enabled on Apple Watch, open the Watch app for iPhone and go to the My Watch tab.