Casio G-shock Men`s Master of G Compass Mud Resist Digital Watch GG1000-1A | 079767182120 - Casio watch [GG10001A] - Black Dial, Black Band | Fash Direct
G-Shock GG-1000 User Manual / Casio Module 5476
Casio G-Shock GG-1000 MUDMASTER module 5476 review &tutorial how to set up all the function - YouTube