I will enter address of my hotel. When it open the location is dead center. I will then, minus or plus, depending on my my need. The location now is no longer dead center. I now have to drag location back to center to see what is near buy.
No idea Dick, but why not ask in a more appropriate forum, like a Google community forum. They would be the experts surely?
I have always just dragged the map as you do now,
I just scroll with the mouse, rarely use the + and = buttons. The movement does seem different between them?
This example app extracts EXIF data from photos to obtain the geolocation data where the photo was taken. A static map & the nearest address are displayed.