There are three ways to navigate:
Ctrl key and scroll the mouse wheel, the map will scroll horizontally.
While hovering the mouse over every tile, you'll get the tooltip showing on the left. The tooltip text contains the following data:
The contents of the tooltip text are dynamic. When the Objective Lab Window is visible (with a valid tac file loaded, and show objectives option is enabled), if there are any objective information associated with this tile, these will be displayed as well.
When you click the right mouse button, you'll get the following menu:
OK on this dialog will update the tile with the new values.
The contents of this menu are dynamic. When the Objective Lab Window is visible, some other menu items are added to the above.