An excellent activity that requires students to use bearings and scale to be successful. It would work well as a group activity. Three thumbs up!

Left-click to play the game on-line, or right-click (and select Save Link As or equivalent) to download it:
http://www.mathsonline.co.uk/user/78/6216.swf

The students use the concept of triangulation to locate Digit.
http://pbskids.org/cyberchase/games/circles/

A simple but effective interactive animation showing the relationship between enlargement and area. Choose a scale factor from two to ten then click the arrow button to enlarge the square.
http://www.yenka.com/freecontent/item.action?quick=i9#