Google allows the use of the maps you create in their “My Maps” application with certain restrictions.  However, if your project needs a big blow-up of the map, a simple screen shot won’t cut it.  The computer screen is 72 dots per inch, and when you expand that it quickly becomes a mosaic of big pixels.

If you have Adobe Photoshop software you can zoom in and create four, nine, or sixteen overlapping tiles that can be stitched together into a single huge image. to do this assemble the component tile files in a folder on your desktop. Then open Photoshop. Using the Files pull-down menu choose “Automate” and then select “Photomerge” at the bottom of the list.  You will get this screen:

Photomerge Window

These various options would correct for distorted perspective if you were merging a panorama of scenery photos, but the map tiles are uniform perspective and scale. “Auto” will work great.

My project was a poster-size map of Pennsylvania legislative districts. The end product will be over six feet tall, but you have to get really close to see the pixels, and it has enough detail that a person can find their home on the map and determine who represents them.

If Adobe Photoshop is too pricey for your budget, search the web for photo stitching software.