It's Navigation Calculator has to help users not to count manually the coordinates for Navigation Computer of IL-62. NC count coordinates for MainOrtho and PrivateOrtho.
If you want, you can use .exe file which can work without Py
Donwload link: https://drive.google.com/drive/folders/1pt07f7CX2kM8ahdivcRytMqZWjsHCghj?usp=sharing