@Steve

Sorry I broke your system. As part of its increased security Gmap4 will now display an error message if there is any URL parameter that it does not recognize.

I am always open to the idea of adding additional URL parameters. But the name 'xloc' likely lacks intuitive meaning for most people. Also, any URL parameter should cause the map to do something

Hmmmm...

What about title=Mt_Whitney

You could search the Firefox history on Whitney.
And the Gmap4 code could (1) convert the underscore to a space and (2) display 'Mt Whitney' as a title on the map.