Because it's better that way. If you start the line on the map, and drag it out, where the line crosses the tool helper shows the actual bearing of the line. this is only possible if the tool is upside down
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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