About the compass
Depending on your wireless service provider, this feature might not be supported. You can only use the Compass application in portrait view.
You can use the Compass application to determine your direction in relation to the Earth's magnetic poles or to true north. You can also use the Compass application with location-based applications, such as the Maps application that might be preloaded on your BlackBerry® smartphone, to provide you with information such as driving directions or your position in relation to points of interest. The Compass application is most accurate when you place your smartphone on a flat surface or hold it horizontally.