G-Shock MRG-8100B-1A - Manual (Page 56)

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2.
Hold down B for about
three seconds until the
watch beeps.
This will make the World Time • •
City you selected in step 1 (New
York) your new Home City.
Your previous Home City (Tokyo)
• •
will be your new World Time City.
Important!
If you are using the watch in Japan, be sure to select TYO (Tokyo) as
your Home City. Selecting another city code will make it impossible
to receive the time calibration signal, which will cause the watch’s
time setting to be off.

3ECOND