Grabbing Google Maps and other services with available tools

The post is inspired by this respected post by the respected @P_r_i_m_a_t.
Needle for invention is cunning, I do not know how to program, and I really want to have posters from maps. Therefore, I usually do this:
- I take the necessary part of the map,
- I copy the code provided for publication on web pages (something like <iframe width = "425" height = "350" frameborder = "0" and so on),
- in the code editor, I change the width and height iframe to the ones needed for the printed card (for A0, this is 14043 x 9933 px),
- save the code locally kak html document,
- I open it with a browser (here, ahtung! If the format of the future poster is really A0, then to open such a monster by the browser, resources are needed),
- extension for Firefox fireshot make a screenshot,
- here this free program I process the image for printing.
- I take the file and carry print.

Here it is. Use who is not a programmer :)