The slide rule is now flattened out and the crystal domed, which visually creates a more compact profile of the watch. But let's be clear here: Breitling didn't make the cases any smaller. The original Navitimer was executed with a 40mm case. This new Navitimer tops link out at 46mm. For those who want to stay as close to the original as possible, the 41mm variant is the closest we're going to get. They all boast the Caliber 01, and they're all water-resistant to 30 meters.