https://www.wpgmaps.com/help/docs/creating-a-custom-map-theme-google-maps-engine/
Creating a Custom Map Theme - Google maps engine - WP Go Maps Documentation
This article covers creating a custom theme for your WP Go Maps Map. You will learn how to create a theme for Google Maps engine and how to add it
google maps engine
https://mapsengine.google.com/about/index.html
Google Maps Engine – Google
google maps engine