CASIO G-SHOCK SPORTS GBX-100NS-1DR DIGITAL BLACK WATCH

How does the tide graph work, and can I rely on it?

The watch holds tide data for your chosen location, pulled from the CASIO WATCHES app, which covers approximately 3,300 surf points worldwide. You set the point you want and the graph tracks the tide against the time. Casio states the displayed information is intended for reference only — it is a planning aid, not a substitute for local conditions, official tide tables or your own judgement in the water.

What do the moon and sun functions show?

Moon age and moon phase, plus sunrise and sunset times with daylight pointers on the display. Together with the tide graph that is the full picture for planning a session — how much water, how much light, and what the moon is doing to the swell. The same reference-only caveat applies.

Does it need a phone to work?

Not for timekeeping. World time, the alarms, stopwatch, timer and step counter all run on the watch. The app is what loads tide and sun data for a chosen surf point, sets the time automatically, opens up around 300 world time cities, and passes through notifications and phone finder. Without the mobile link, accuracy is ±15 seconds per month.

Why does the display go blank sometimes?

That is the power-saving function. Casio states that the display goes blank to save power for three hours each day. The watch keeps correct time throughout and the display returns on its own — it is not a fault. The operating guide for module 3482 sets out exactly when this happens and how to switch it off.

Can I surf and swim with it?

Yes. 200-metre (20 BAR) water resistance covers surfing, swimming and recreational water sports, which is what the G-LIDE line is built for. It is not rated for saturation diving or use with helium-based gas mixtures. Avoid operating the buttons while the watch is submerged.

Is it solar powered?

No. The GBX-100NS-1 runs on a CR2032 battery with an approximate two-year life. It has no solar charging and no radio-controlled timekeeping — the time is set automatically over Bluetooth through your phone instead.

Will it fit my wrist?

Casio does not publish a compatible band size for this model, so we cannot quote a range. The case is 50.9 × 46mm and 14.7mm thick, at 66 grams. The resin band fastens through holes with no in-store sizing step, but it is worth trying one on if you are unsure about the size.

What warranty does this watch come with?

The GBX-100NS-1DR comes with Casio's official 1-year warranty when purchased from City Chain Singapore, an authorised Casio retailer.