Accessing and using your custom Map My City instance requires some technical expertise, but with these steps, you can create a custom map for emergency services or plumbing purposes.
For plumbing purposes, you can add custom water pipe lines to visualize your system's layout. To do this:
To view your custom Map My City instance, click on the "Maps" menu and select "View Maps" or press F5
Note that this is just an example, and you should consult with a qualified engineer or plumber to ensure your custom map is accurate and compliant.
https://www.google.com/maps/d/viewer?mid=1685rRvosbXxJsjswVn5UtparDK0YPaLU