If you really want a crisp thumbnail without blur on mobile, you actually need a fairly large screen...

For reference, my tablet has a resolution of 2000x1200.
That's crisp enough for a good thumbnail.
You could increase resolution, but sometimes it doesn't work out...

My guide for mobile screenshots is just useless. All effort on it wasted, but I will remaster it now that I have more experience.

I guess I'll show off some of that experience.

I might use some of these screenshots for the remastered guide.
Maybe I'll make it today?
Some of the photos link you to the aircraft featured in them.
Until then, I'll be taking a good old rest.