He mentioned to me that in pilot school he did in fact learn how to use a slide rule and watch bezel slide rule.

FORBES: Why Some Pilot Watches Have a Slide Rule

However, Mountain View's added a new twist when you'd flip up its bezel -- at that point, it's claimed that the watch could channel a plethora of other Google apps, like Gmail, Goggles, and Maps.

ENGADGET: Google patents smart watch with flip-up display that could reveal everyday objects' secrets