The Key Map tab displays a small overview map showing the location of the main map window in relation to the full map extents. Use the overview map to stay oriented as you zoom in and out. You can also change the extent of the map by clicking on the overview map.
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Tools and Functions

Key Map Tab

index map image A Key Map gives the main map context by showing where the map fits into the surrounding geographic area.

The red rectangle reflects the current extent of the map viewer. Clicking on the key map will move the map extents (and red rectangle) to center on the mouse location that was clicked.

You can display the Key Map by pressing the Key Map tab on the function menu. Choose another map function, and it's gone.