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Double click in the Project Explorer tree at the map you want to see, to view a map. You can see the x and y coordinate coordinates by selecting 
in the bar below the maptoolbar. Clicking on a location on your map shows the value in the Properties window. When in the toolbar is selected a tooltip shows you the values when moving around the map with your mouse. See picture below.
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you can view values of your map at specific coordinates
When you want to compare values of several maps you can add a new item in the project explorer called 'map'. Select 'add' -> 'new item' -> 'map'. Now you can drag multiple maps in the map window to compare the values at the same coordinates.
By adding a 'map' item, you can compare several maps
Change legend
You can change the legend of the map, go the the 'map contents' window when your map is selected. By double clicking on the map in the map contents or rightclicking and selecting properties, you can adjust your legend. When you want to change the boundaries of your legend you must select the tab 'Quantity'. Colors and lines can also be adjusted.
To add a legend, select 'set classification' with right click at the map.
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See also map contents
The legend window will appear. In this window you can set amount of classess, minimum and maximum value. The instrument will then suggest a legend. You can adjust these classes by typing different limits. The text near the classes can be changed by typing in the label box. You can select predefined colours from the colour ramp pulldown menu or you can set the colours yourself by double click at the colour box for each classification.
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