Recorded on USB stick card but can't find in a system where open my USB stick ?!
The folder in which to find it?

The system is not opened. You need to boot the computer from the USB.

That is, you begin with the computer off.

The USB is inserted.

You start the computer.

The computer loads up Navigatrix and runs it independently from any operating system you already have.

Chances are your computer needs to be instructed to use the USB stick and not your internal hard drive. To do this you must tell the BIOS (generally the black/white screen you see when the computer starts) that it needs to use the USB first.

Here are some off-site tips:
http://krasgmu.net/publ/1/4-1-0-101
http://www.resetwindowspassword.com/how-to-set-bios.html
http://pcsupport.about.com/od/tipstricks/ht/bootusbflash.htm

If you have difficulty let me know and we can go through the process step by step.

удачи

I'm sorry-my Navigatrix opens in VirtualBox.Hence, this question

...then mount the ISO as a CD. Boot from there. No USB needed.

Navigatrix version 0.5 not working with VirtualBox 5.1.18. GRUB is loading but the kernel does not.