CASIO
CASIO G-SHOCK G-Rescue G-7900A-4C watch
A shock-resistant digital watch with tide graph, moon data and 200 m water resistance for marine sports
- StyleSports
- MaterialResin
- MovementQuartz
- ShapeRound
- DisplayDigital
- DateDate
- Shock-resistant resin case handles hard knocks
- Tide graph and moon data for coastal timing
- World time covers 29 zones across 48 cities
- 200 m water resistance suits diving and surfing
- Auto EL backlight with afterglow aids night reading
Purpose-built tool watch
The Casio G-SHOCK G-Rescue G-7900A-4C is a quartz digital watch housed in a 50.0 mm resin case with matching red resin band and mineral crystal. It delivers 200 m water resistance, shock-resistant construction and a low-temperature LCD rated to -20 °C, making it suitable for maritime and outdoor professionals who need reliable data at a glance.
Suited for tide and multi-zone tracking
Tide graph, moon-age data, 29 time zones covering 48 cities, four multi-function alarms with snooze, 1/100-second stopwatch and countdown timer serve divers, sailors and travellers who rely on solar-lunar cycles and global scheduling. Buyers who want heart-rate monitoring, GPS positioning or smartphone notifications should look elsewhere, as this model provides none of those functions.
Steady operation in extended use
Auto EL backlight with afterglow and flash alert remain readable during prolonged low-light missions, while the pre-programmed calendar runs to 2099 without adjustment. Quartz accuracy of ±15 seconds per month and a 68.2 g all-resin build keep timing consistent and wrist fatigue minimal over multi-day deployments.
Highlights
- Shock-resistant resin case handles hard knocks
- Tide graph and moon data for coastal timing
- World time covers 29 zones across 48 cities
- 200 m water resistance suits diving and surfing
- Auto EL backlight with afterglow aids night reading
Specifications
| Brand | CASIO |
|---|---|
| Style | Sports |
| Material | Resin |
| Movement | Quartz |
| Shape | Round |
| Display | Digital |
| Date | Date |
| Band Material | Resin |
| Fastener | Buckle Clasp |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Material | Resin |
| Case Thickness | 50.00 mm |
| Crystal | Mineral Crystal |
| Water-Resistant | 200m |
| Special Features | Mineral Crystal,Buckle Clasp,Day and Date Display |
Questions about this item
Does the watch need a smartphone or computer to operate the tide graph and moon data?
No, the tide graph and moon data are calculated internally from the entered date and time; no external device or connection is required.
Can the 200 m water resistance handle the same depths as older 100 m G-Shock models I already own?
The 200 m rating is suitable for professional marine activity and serious surface sports, while 100 m models are rated for swimming and snorkelling only.
How can I verify the ±15 seconds per month accuracy after setting the watch?
Compare the displayed time with a reliable reference clock over several weeks; the watch should stay within roughly half a minute of that reference each month.
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