Why do so many watches have subdials these days?

There are two reasons. First, multifunction watches are extremely popular, and subdials are useful, and often necessary, in displaying the various types of data they measure. Second, subdials give a watch a high-tech and/or sporty look - which is extremely fashionable nowadays. That's why some watches that don't really need subdials -ones that simply show the day of the month, for example, or incorporate a seconds hand - have them anyway. Subdials have become extraordinarily important in watch design.

What are the three sub-dials on a chronograph watch?

Generally, a chronograph has one sub-dial that records elapsed minutes and is graded in segments of 30, while another sub-dial graded in segments of 12 records elapsed hours. The third sub-dial may show the elapsed seconds, or, if the seconds are counted by a central sweeping hand on the main dial, this sub-dial may count fractions of a second. If the third sub-dial runs continuously even when the stopwatch is not running, it is most likely used in conjunction with the main dial and is independent of the chronograph feature.

Breitling Navitimer Y2431012/BE10/443A-with three sub-dials design

For this replica Breitling watch, on its black watch dial, there sets the date display at the position of three o’clock, and the three small plates are timing dials, and the 12 hour timing dial is set at six o’clock, timing seconds dial is set at nine o’clock, 30 minutes timing dial is set at 12 o’clock. On the wide watch bezel there is print the 24 hour timing scales. And the watch indicates the second time zone time of the 24-hour clock time with the red triangle tip pointer; And ultra precise ratchet two-way rotating bezel can make the wearer clearly and easily read the third time zone time. Wrist bracelet uses folding clasp links, clasp is made with stainless steel, and the Breitling symbol is engraved on it.