its Chronomat models. This bezel became most associated with the Navitimer, launched in 1954. The name Navitimer comes from two words were used to describe its purpose: Navigation and Timer. During the 1950s and 1960s, a version of the Navitimer was offered by the Aircraft Owners and Pilots Association with the AOPA logo on the dial. In 1961, Scott Carpenter, one of the original astronauts in the Mercury space program, tasked Breitling with incorporating a 24-hour dial instead of the normal 12-hour dial, due to lack of day and night in space travel. Breitling produced the 24-hour Navitimer, which Carpenter wore on his 1962 space flight. Breitling proceeded to produce a commercial version of the 24-hour version, the Cosmonaute Navitimer, with both Breitling and AOPA logos. The first automatic Navitimer chronograph was introduced to the public in 1969; its movement was co-developed by Breitling, Dubois-Depraz, Heuer, and Hamilton. Chronomat The Chronomat is a collection from Breitling released in 1942, and remains one of the best-selling models produced by the manufacturer. The first Chronomat had a circular slide rule and its design was inspired by military watches. Its movement was the Venus 175 with 17 jewels, a manual wind movement. The current Chronomat was released in 2009 and was the first watch produced entirely by Breitling, featuring the in-house B01 caliber. The B01 movement has a 70-hour power reserve and COSC certification. Emergency The Breitling Emergency watch contains a radio transmitter for civil aviation use, which broadcasts on the 121.5 MHz distress frequency and serves as a backup for ELT-type airborne beacons. For military users, the Emergency has a miniaturized transmitter operating on the 243.0 MHz military aviation emergency frequency. Under normal conditions—flat terrain or calm seas—the signal can be picked up at a range of up to by search aircraft flying at . Since February 2009, the Cospas-Sarsat Satellite System has not monitored the 121.5/243.0 MHz frequency; however, the signal transmitted by the Emergency was never strong enough to be picked up by satellite, and Breitling has announced that, as these frequencies will still be monitored by aviation, particularly during the localization phase of a rescue attempt, there are no plans to modify the signal's frequency. Reuters reported in January 2003 two British pilots, Squadron Leader Steve Brooks and Flight Lieutenant Hugh Quentin-Smith, crashed their helicopter in Antarctica and were rescued after activating their Breitling Emergency transmitter watches. The Emergency