Slide rule on my watch - Seiko Prospex SBDR001

I just bought a Seiko Prospex SBDR001. I bought it mainly for the well integrated digital world clock and the analog watch. It allows you to easily transfer the time from the world clock to the analog watch and the navigation in the world clock is simple. The daylight savings is manual, but I've finally decided after being screwed by daylight saves one too many times that many I should keep my head around it, rather than trying to get my watch to keep track.

This watch has a slide rule. It allows you to multiply, divide, solve simple equations and do conversions very fast. I started fiddling it with it during take-off and landing when you can't use electronic devices and I discovered that I really enjoyed my first experience with a slide rule.

It also explained in the instructions that if you point the little hand at the sun, the point between the 12:00 mark and the little hand is South. (To the left in the morning and to the right in the afternoon.) That makes sense in retrospect, but I didn't know that.