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And finally you flip it, and buy something that makes you happy again for a while, and then you flip it, and... No, it never ends.

You're right. No one in his right mind uses his watch to calculate speed, or gas consumption. But it does have that Topgun vibe.
...

I'd imagine it would go like this:

Me: "Hi, I've got a Breitling Navitimer here, could you please explain to me how the sliding ruler thingy works?"
Sales guy: "James, we've got another Navitimer...

That's it, thanks man!

https://uploads.tapatalk-cdn.com/20180821/8f188e44c9b06acb4844c4d01f09df6a.jpg

There are 49mm Navitimers, maybe they are easier to read (or not...)

https://uploads.tapatalk-cdn.com/20180821/a867c182328bec041223c4733355e9cb.jpg

I've downloaded the slide rule manual, but I don't believe my bezel is in there. The scale goes from 1 to 9 on both rings.

Yes, the Navitimer is great. I never really liked Breitlings, most being...

I've searched a bit, but couldn't find the answer. What is the function of the numbers on the bezel of my Breitling A30021?

The rotating outer ring says telemetre, that should be distance...