I see a warning "Google Maps API warning: NoApiKeys"

Notice: Beginning on June 11, 2018, an API Key is now required for every map project using Google Maps library. You can read more about this Google guideline here.

If you see a warning in your browser's Javascript console that says "Google Maps API warning: NoApiKeys https://developers.google.com/maps/documentation/javascript/error-messages#no-api-keys", the reason is that you haven't configured your Google Maps API keys yet.

Please enter your Google Maps API key in GravityView Settings screen. Learn more in this article:  Signing up for a Google Maps API key.