The Customer Map feature has finally been removed from the Android app.
It was always a vanity project, that was technically ingenious, but hardly ever worked. It was difficult for the user to set up, and it kept getting clobbered by updates from Google, which was anxious to monetise its technologies.
The guidebook and user manual will be updated in due course. At the moment only the menus have been patched, in case anyone is actually using the feature.