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Bringing up the contextual menu on the picture (Control-click on Macs, right-click on PCs) allows you to zoom in from a planetary view to a county level view, then back out.
Zooming-in automatically switches to the grabber hand cursor--allowing you to slide the image up/down, left/right.
Show All resets the picture to the initial view. The commands in the Quality submenu turn anti-aliasing on/off.