While you have the time in an analog fashion

The chronograph function is combined with a digital tachymeter in way that I haven't seen before. A tachymeter is used to measure speed traveled, assuming you can measure a pre-defined distance. Say you want to measure the speed of something, and you can gauge when it has traveled exactly one mile. At the starting point of the time you'd start the chronograph, and then stop it when whatever you are measuring travels one mile. Using a few of the screens together, you can read the speed traveled. The watch settings allow you to adjust the unit of measuring (mile, kilometer), and I think the distance traveled as well. It is a fun little toy that will no doubt be useful to a few people. The subsidiary analog hand at the top of the dial is used for this purpose actually. It is used with the digital window to its right to measure speeds up to 1000mph or 1000kph. There is another little window for speeds over 1000! While you have the time in an analog fashion, you also have the ability to have the time digitally in the lower left digital LCD window. This is sometimes easier depending on your preferences - or when reading the time at night. Which brings me to a issue with at least some of the GA100 watches. The analog hands have no lume, but the hour indicators around the dial do have lume. Why this is? I don' t know. There is a backlight in the form of a lower mounted LED light, but when it is turned on in the dark it sort of washes out the LCD screens and makes the hands not super easy to read (especially the red hour hand on this color combo). For me, this means that while it is not impossible to read the GA100 at night, it is not an ideal G-Shock for this purpose. There are others though that excel at night reading.