A Zoom Center is an area where all 8 zoom levels (Top,64m,32m,16m,8m,4m,2m,1m) are available for b/w or color aerial maps or 7 levels (Top,64m,32m,16m,8m,4m,2m) for color topo maps. The map tiles of the Zoom Center are outlined with a magenta rectangle on the map (see screenshots for example). For the rest of the area, only upper-level maps (Top,64m,32m,16m) are available.
If you are interested in detail maps for some area, i.e. Near a geocache, make a Zoom Center around it. When going there, use the upper-level maps for the general area.
On site, you can use the detail maps to simplify navigation and orientation. More.
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