There are 3 different sizes of maps that you can download to your GPS. Each will have a different resolution. The option with the larger coverage area will have less detail and a lower resolution. The smaller option will have a smaller coverage area, but will have more detail and higher resolution. So if you want to zoom in tight on a location, you will want to have the smaller maps, so the image does not become pixilated in the unit when you zoom in closely. These are the coverage area of the three scales that you can choose from. 1. 356 acres .75 mi x .75 mi 2. 1423 acres 1.49 mi x 1.49 mi 3. 5693 acres 2.98 mi x 2.98 mi You can visit www.bushnellgps.com and create an account and be able to view the detailed maps that are offered.