Getting Started with the Map Viewer : Getting acquainted with the navigation tools : Keyboard shortcuts
  
Keyboard shortcuts
Several keyboard shortcuts are available to pan, zoom in or zoom out on the map. Use the following keyboard shortcuts to move the map to a desired scale or to view a specific area.
Table 3 
Shortcut
Purpose
Up arrow
Pans the map up
Down arrow
Pans the map down
Right arrow
Pans the map right
Left arrow
Pans the map left
Plus
Zooms the map in
Minus
Zooms the map out
NOTE: 
You can also zoom in or out from the map using the wheel of your mouse.