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Red resin digital watch with round case and large buttons

CASIO

CASIO G-SHOCK G-Rescue G-7900A-4C watch

SKU CH-BN5E-9RS3C

A shock-resistant digital watch with tide graph, moon data and 200 m water resistance for marine sports

  • Watch movementQuartz
  • Product shapeRound
  • Display typeDigital
  • Date displayDate
  • Strap materialResin
  • Closure typeBuckle Clasp
  • 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.

How it compares

Measured against everything we stock in Analog & Digital Wristwatches, at today’s prices. Recalculated every night.

Price $97.99
Cheaper than about 59% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Design styleSports
Item conditionNew
Display
Display typeDigital
Size & build
Main materialResin
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Housing materialResin
Case size50 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementQuartz
Date displayDate
Suitable forMale

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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