For beachcombing, the Citizen Promaster WaveTracker JV3000-13E is the clearer pick if you want a tide watch with explicitly documented location coverage: Citizen says it provides tide information for 203 locations. “Gulfmaster,” by contrast, covers several G-SHOCK models, and their functions differ. The GWN-1000 has tide and moon displays; the GWN-Q1000 adds a water-depth sensor. Either watch is a planning aid, not a substitute for local tide forecasts or official tide tables.
Which watch is better for beachcombing?
Choose the Citizen JV3000-13E if a dedicated tide display and clearly stated location coverage are your priorities. Citizen documents tide information for 203 locations, alongside moonphase and sunrise/sunset information. The official product pages describe its TIDE mode and related functions, but they do not establish that it is more accurate than a Gulfmaster. Citizen’s US listing and Japanese product page describe the watch’s features.
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A Gulfmaster may suit you better if you specifically want a G-SHOCK and have identified a variant whose other features matter for your outings. The GWN-1000 documents tide graph and moon-age displays; the GWN-Q1000 adds a quad-sensor suite that includes water-depth measurement. Those features are model-specific, not guaranteed across the Gulfmaster family.
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Citizen Promaster WaveTracker JV3000-13E
Citizen specifies tide information for 203 locations, with tide, moonphase or lunar-age, and sunrise/sunset displays described across its product pages and U812 manual. The manual says the tide graph information is based on 2025 data. It warns: “Use information shown with the tide graph function only as a reference. The information shown does not reflect effects of the terrain and weather and it may include calculation errors.” It also says not to rely on the display as tide information for sea navigation. Read the Citizen U812 instruction manual.
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Casio G-SHOCK Gulfmaster
Casio’s GWN-1000 page describes a tide graph for a user-specified region and a moon-age display. Casio’s US fishing-watch listing describes tide and moon data for the GWN-1000B-1BJF variant, along with solar power, radio reception, and 200 m water resistance. These listings concern named models or variants; they do not establish the same specifications for every Gulfmaster. See Casio’s GWN-1000 page and its US fishing-watch listings.
Casio’s cited tide-and-moon setting guidance says users must enter location information, including UTC offset, longitude, and lunitidal interval, and labels the resulting information reference-only rather than for maritime navigation. That guidance is for module 3559; it does not identify the module in every Gulfmaster, so check the instructions for the exact watch you are considering. Casio’s GWN-Q1000A-1AJF listing is a separate model page, not a universal Gulfmaster manual.
Rank #2
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How do the specific models differ?
| Model | Tide and moon information | Other documented features | What to check |
|---|---|---|---|
| Citizen Promaster WaveTracker JV3000-13E | Tide information for 203 locations; moonphase/lunar-age information. The U812 manual says tide graph data is based on 2025 data. | Sunrise/sunset, yacht racing timer, perpetual calendar, chronograph, LED lamp, sapphire crystal, 42 mm case, and 200 m water resistance, according to Citizen’s US page. The Japanese page lists 42.4 mm width, 13.9 mm thickness, and 102 g. | Confirm location support and whether the watch’s size, display, and controls work for you. |
| Casio G-SHOCK Gulfmaster GWN-1000 | Tide graph for a user-specified region and moon-age display. | Casio highlights a barometric-tendency alarm, sensor functions, Smart Access controls, and double LED illumination. | Confirm the exact variant’s specifications, module instructions, condition, and local availability. |
| Casio G-SHOCK Gulfmaster GWN-Q1000 | The cited feature page establishes sensor functions; it does not establish tide-location coverage comparable to Citizen’s stated 203 locations. | Quad sensors include water-depth measurement up to 50 m, compass bearing, and air-pressure and temperature measurement. The 50 m figure is the sensor’s measurement range, not the watch’s water-resistance rating. | Check the exact reference and market: Casio’s Japanese listing for GWN-Q1000A-1AJF marks that variant discontinued. |
Sources: Citizen US, Citizen Japan, Casio GWN-1000, Casio GWN-Q1000, and Casio GWN-Q1000A-1AJF.
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Use the tide display to orient yourself, not to set your safety margin
A watch’s tide display cannot account for local terrain and weather in the way a site-specific forecast can. Before setting out, check an official local tide table or forecast for the beach you plan to visit. Take particular care where an incoming tide could cut off a route or access to a headland, cove, or tidal area.
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Compare the exact watch, not just the family name
Gulfmaster is a family label, not one specification sheet. Verify the full model number and regional variant before buying, especially for tide functions, sensors, water resistance, power, and module-specific setup. The Citizen listing identifies its JV3000-13E with Eco-Drive; Casio’s cited US listing attributes solar power and radio reception to the GWN-1000B-1BJF variant. Do not assume those details apply to every model.
Consider fit, visibility, and the outing’s other needs
The JV3000-13E is listed at 42 mm in the US and 42.4 mm wide, 13.9 mm thick, and 102 g in Japan. Its documented extras include a yacht racing timer and LED lamp. If you are considering the GWN-Q1000, its water-depth measurement and compass, pressure, and temperature sensors may be more relevant than a broader tide-location list—but the depth sensor’s 50 m measurement range is not a water-resistance rating. Compare how each exact model wears and how easily you can read and operate its display in the conditions you expect.
Rank #4
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Price and availability depend on the market
Citizen’s US product page displayed a price of $636 against a listed original price of $795 when accessed on October 12, 2026, and gives a launch date of June 3, 2026. Those are time-sensitive US listing details, not a guarantee of current price or stock elsewhere. The GWN-Q1000A-1AJF is marked discontinued on Casio Japan’s page; that does not establish the availability of every Q1000 reference in every market. Check your local seller and the exact reference before deciding.
How to choose
- Choose the Citizen JV3000-13E if you want a clearly specified 203-location tide function, with moon and sunrise/sunset information documented by Citizen.
- Choose a GWN-1000 Gulfmaster if its tide and moon displays, G-SHOCK design, and exact model’s additional functions fit your preferences.
- Consider the GWN-Q1000 if you specifically value its documented sensor package, including water-depth measurement, and can find the exact reference in acceptable condition and availability.
No comparative accuracy test is established by the cited manufacturer pages. The strongest evidence-based distinction is Citizen’s explicit 203-location coverage, versus the need to compare Gulfmasters by exact model and setup.
Quick Recap
Best Value
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