Moshe,

The only thing that makes this hard is your requirement to download and view the charts using "standard image-viewing software". That requirement puts you in the business of trying to stitch sectional charts together, which is tedious.

Instead, you should consider using specialized software on your phone that handles this problem. If you have an Android, you can use Avare, which is wonderful and free. On the iPhone you can use Foreflight, which involves a subscription. There may be free options for displaying sectionals on the iPhone that I don't know about.

On the PC, the SkyVector website is outstanding for flight planning.

Lynn Alley
"2KA"