If The map uses the coordinates you use yourwon domain Google Maps can require an API keyhave entered in SETTINGS->PROPERTIES ->DESCRIPTION.
If you use your owon domain Google Maps yo might need to add an Google Map API Key in SETTINGS->BOOKING PAGE ->DEVELOPERS. You can obtain an API key from Google and enter it here, usually a free key is sufficient. https://developers.google.com/maps/documentation/javascript/get-api-key See the developer console in your browser for more information about the map problem, Google will normally display information there about the problem and how to resolve it.