ALWAYS! On all capable G's. IMHO, one of the best reasons to own a digital watch, but it all depends upon what what you want/need the watch to do for you...Do you use the hourly time signal on your Casios?
I use it on my atomic solar G-Shocks: GW-9400 Rangeman, GW-5000 and GW-M5600BC.
...you spent a lot of time at school, fcasoli.Yes, I use hourly signal. I love it because I remember in 80 years, at school, a lot of beep not synchronized...
Watches: G-Shock Rangeman GW-9400 Black, Olive, Camouflage, GW-M5610
Yes, but a lot of students with beep in the same time...you spent a lot of time at school, fcasoli.