Show a Scale Indicator in Maps for Mac OS X
The Maps app in Mac OS X is a useful tool to pre-plan routes, generate map files for offline usage, send directions to an iPhone, and much more, but one critical cartographic component that’s missing by default from all Maps views is any sort of scale indicator, making it difficult to get an idea of how far one thing is from another.
But not to worry, the Maps app in Mac OS has Scale as an option, you just have to toggle it on for the scale (in feet and miles, or meters and kilometers) to be visible.