The worksheets on this site are created in PDF format. To view and print PDF files, you need the free Acrobat Reader. If you don’t have it, you can get it here. This website is currently in the late stages of its development, a state referred to as beta. As with all beta software, it has some quirks and many parts are not yet available. We are working hard to finalize the system’s structure, and roughly once every two weeks we roll out new functionality towards this goal. Until then you may notice that some resources move or even disappear for a while. =This Mercator projection map can be configured to display just the navigational coordinate attributes of the Earth such as lines of latitude and longitude, polar and tropic circles, equator and prime meridian. You can also choose to display the compass and map scale. Source.