This sounds too complex...
But the point that April suggested, I want to do that,
Basically have a few places on the map, the place which you select from the gallery, opens up a new screen with only that specified place.
The overlay grid is complex for sure...we do it for floor maps and other plans, not so much on the Maps, but the coordinate concept would be the same.
But...the solution that @aprildunnam put out in those pictures is very possible today and easily. In that case she was relying on the Gallery and other PowerApps controls to be the items "clicked" on...not the map image itself.
Basically it is genrating different images of the maps using buttons, and not changing the map itself.
For now, it suits my basic needs.
Thanks to both of you for all the help...