Vector maps are vector-based images. What this means for the user is that vector map images are not made up of a series of pixels, instead, they are made of ‘vector paths’ that can be blown up to any size without image distortion. Vector maps usually come in a variety of formats, all of which can be opened using Mac OS’s native image viewing application, ‘Preview.’ Locate the vector map image on the computer and note its file extension. Original vector images (including maps) are created using the Adobe Illustrator program and are saved with the Adobe Illustrator file extension ‘.ai.’ Vector maps can also be saved as ‘.pdf’ or ‘.eps’ files. These formats limit your editing options, but work just fine for vector map viewing. Open the computer’s ‘Applications’ folder and double-click the ‘Preview’ application. Click the ‘File’ tab and select the ‘Open’ option. Locate the vector map file, highlight it and click the ‘Open’ button to open the image in ‘Preview.’ Allow several seconds for the vector map file to open in Preview. With the vector map open in Preview, view the map at any zoom level and print any portion of the map at any zoom level. Alexander Poirier began writing professionally in 2005. He worked as the editor-in-chief of the literary magazine ‘Calliope,’ garnering the magazine two APEX Awards for excellence in publication. Poirer graduated from the University of the Pacific with a Bachelor of Arts in English. Source.