It features an analogue and 12/24 LCD digital display, battery end-of-life indicator, digital perpetual calendar, bi-directional pinion bezel with compass scale, circular slide rule
, sapphire crystal and glare-proof on both sides.
In 1942, Breitling introduced its famous Chronomat model - the first watch fitted with a circular slide rule
The famous Navitimer circular slide rule
enables pilots to perform the entire range of calculations relating to airborne navigation directly on the wrist.
This reputation was solidified in 1952, when Breitling launched its legendary Navitimer wrist chronograph featuring a circular slide rule
serving to perform all navigation-related calculations.
The new ExpoAperture Depth-of-Field guide is printed front and back on two tough plastic discs that rotate against one another, somewhat like a simplified, compact circular slide rule