Restore default viewing parameters.
The arrow keys move the view in the direction indicated on arrow key (pans overlay in opposite direction indicated on arrow key).
Zoom in/out toggle about cursor location (Spacebar Zoom)
Deletes currently selected line(s).
Backs previously entered points out one at a time from profile line.
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Increases/decreases Planview Scale (Overlay).
Toggles display of Cut/Fill shade map.
Compass cycle (Off, Left, Center, Right).
Snap toggle.
Displays the previously selected guide.
In Edit Mode, breaks line nearest to the cursor at a point with the least distance to it.
Inserts point over the line nearest the arrow and snaps to the line with a new profile line.
Snaps to the nearest point and starts entry of a profile line.
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Displays the Layer Selection dialog.
+ 
Sends currently displayed view to Print Preview.
+ 
Hides all background layers.
+ 
Undo last edit(s) - up to eight stored.
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Redo previously undone edits