Wakkanai Breakwater Dome fishing today
- Best time tomorrow 2:10–3:40 am great day · 9/10
- Tide now 0.4 ft ↑ rising · high 3:08 am (1.3 ft)
- Waves · water 4.2 ft · 55 °F moderate · 5.8 s from the west-northwest
- Wind · air 8 mph · 41 °F from the S, gusts 16 · rain
- Sun 6:08 am–4:26 pm 10 h 18 min of daylight
- Moon 88% · 6:08 pm waning gibbous · rises at 6:08 pm
- Coefficient 108 big spring tides · spring tides Oct 27–29
- Major solunar period 12:33–2:33 am today's activity: medium
- High Wave Advisory (波浪注意報) · Wakkanai City: waves up to 9.8 ft, take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 10:18 am · Public Data License 1.0
Official text
Japanese
宗谷地方波浪警報・注意報
宗谷地方では、高波に注意してください。
稚内市：波浪注意報（継続）
波高：３メートル出典：気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.
- Thunderstorm Advisory (雷注意報) · Wakkanai City: take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 10:18 am · Public Data License 1.0
Official text
Japanese
宗谷地方雷注意報
宗谷地方では、竜巻などの激しい突風や急な強い雨、落雷に注意してください。
稚内市：雷注意報（竜巻、ひょう）（発表）出典：気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.
- Gale Advisory (強風注意報) · Wakkanai City: winds up to 29 mph on land, take care. Until further notice. Japan Meteorological Agency (JMA), issued today at 10:18 am · Public Data License 1.0
Official text
Japanese
宗谷地方暴風（雪）警報・注意報
宗谷地方では、強風に注意してください。
稚内市：強風注意報（継続）
陸上 最大風速：１３メートル
最大風速：１８メートル出典：気象庁ホームページ (https://www.jma.go.jp/). TidePlanet has extracted this area’s warnings from the JMA’s, translated their names and converted their figures to the chosen units: this is not an official JMA publication.
Today in Wakkanai Breakwater Dome there is high tide at 3:13 am (1.3 ft) and low tide at 12:06 pm. Tide coefficient 108. Right now the tide is rising toward the high tide at 3:08 am. The sun rises at 6:08 am and sets at 4:26 pm: 10 h 18 min of daylight. The moon is 88% illuminated (waning gibbous) and rises at 6:08 pm. Major solunar periods run from 12:33 am to 2:33 am and from 1:05 pm to 3:05 pm. The next spring tides arrive from October 27 to 29. The sea is moderate, with 4.2 ft waves. There's a gentle breeze from the south (8 mph). Rain, 41 °F.
Fishing in Wakkanai Breakwater Dome today
Best time to fish
Solunar activity today: medium- Low tide at 12:06 pm
- Major period 1:05–3:05 pm
- Rising pressure (+0.45 inHg in 24 h), light offshore wind (6 mph) and some swell (4.8 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 108 (big spring tides)
Your day at a glance
The best window, 12:30 pm to 1:10 pm, combines the 12:06 pm low tide, a major period and some swell, though with rising pressure. Also worth a try from 2:10 pm to 3:10 pm, with a major period and some swell, though with rising pressure.
About Wakkanai Breakwater DomeThe breakwater
In Wakkanai, 0.8 mi from the center. Tides, weather and sun in Wakkanai →
Data from OpenStreetMap and Wikidata: some may be missing or out of date. Check the rules and hours on site. Wikipedia · Fix on OpenStreetMap
Beach day in Wakkanai Breakwater Dome
Is it a beach day?
- Low tide at 12:06 pm: more sand
- Cloudy (93% cloud cover)
- Feels like 35 °F: chilly for the beach
- Rain (0.23 in)
- Moderate onshore wind (14 mph): choppy water
- Dangerous for swimming: 6.8 ft waves every 6 s; high rip current risk
Dangerous surf during beach hours. Stay out if the red flag is up, and never swim where there is no lifeguard.
Today, hour by hour
- Swimming Dangerous · 6.8 ft
6.8 ft waves every 6 s: dangerous for swimming. Stay out if the red flag is up. High rip current risk. If you're caught in a rip current, don't swim against it: swim parallel to shore and wave for help. Always follow the lifeguard's flags.
- Water 55 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 14 mph
Moderate onshore wind (14 mph).
- Tide & sand 12:06 pm
Low tide at 12:06 pm: that's when there's the most sand. High tide at 3:13 am.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority. How it works · The next 7 days
Beaches near Wakkanai Breakwater Dome
We don't know of any named beaches within 6.2 mi of Wakkanai Breakwater Dome.
Missing one? Beaches come from OpenStreetMap: you can add it there. Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL).
Webcams near Wakkanai Breakwater Dome
Webcams provided by windy.com — add a webcam
Tides in Wakkanai Breakwater Dome
Today's high and low tides
- ▲ High tide 3:13 am 1.3 ft · coef. 108
- ▼ Low tide 12:06 pm 0.2 ft
↑ Rising The tide is rising. 11 h 33 min to high tide at 3:08 am.
Tide coefficient 108 for the 3:13 am high tide. Big spring tides. The water rises and falls 1.0 ft between the highest high and the lowest low: a large range for this place. 70 is an average tide here; 90 and above means spring tides; below 45, neap tides. What is the tide coefficient?
2026 extremes: the highest tide of the year is on July 15 (1.4 ft) and the lowest, on February 17 (-0.2 ft).
Diurnal: one high and one low tide a day most days.
Heights above NLLW. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. NLLW
Tide coefficient and range in October
The biggest tides of the month come from October 30 to 31 (coefficient 115, 1.1 ft range). The smallest, on October 24 (coefficient 20, 0.2 ft).
Tide and solunar table · this week
| Day | Sun | Tide 1 | Tide 2 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|
| Today, Thu 29 | 6:08 am · 4:26 pm | High tide 3:13 am · 1.3 ft | Low tide 12:06 pm · 0.2 ft | Coef. 108 | 88% | Major periods 12:33 am · 1:05 pm | Medium |
| Fri 30 | 6:09 am · 4:24 pm | High tide 3:08 am · 1.3 ft | Low tide 1:22 pm · 0.3 ft | Coef. 115 | 80% | Major periods 1:38 am · 2:10 pm | High |
| Sat 31 | 6:10 am · 4:23 pm | High tide 3:14 am · 1.3 ft | Low tide 3:25 pm · 0.3 ft | Coef. 114 | 69% | Major periods 2:42 am · 3:13 pm | Medium |
| Sun 1 | 6:12 am · 4:21 pm | High tide 3:41 am · 1.3 ft | Low tide 5:27 pm · 0.3 ft | Coef. 108 | 58% | Major periods 3:42 am · 4:11 pm | Medium |
| Mon 2 | 6:13 am · 4:20 pm | High tide 4:15 am · 1.2 ft | Low tide 6:52 pm · 0.3 ft | Coef. 96 | Last quarter | Major periods 4:38 am · 5:04 pm | Medium |
| Tue 3 | 6:15 am · 4:18 pm | High tide 4:51 am · 1.0 ft | Low tide 7:54 pm · 0.4 ft | Coef. 79 | 36% | Major periods 5:29 am · 5:54 pm | Medium |
| Wed 4 | 6:16 am · 4:17 pm | High tide 11:11 am · 0.8 ft | Low tide 8:41 pm · 0.4 ft | Coef. 51 | 26% | Major periods 6:17 am · 6:40 pm | Medium |
▲ high tide · ▼ low tide · heights above NLLW. Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Where this tide comes from
Tides from the Wakkanai station (TICON-4), 0.9 mi from Wakkanai Breakwater Dome. Times and heights are its predictions.
Station data attribution: Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data
The sea at Wakkanai Breakwater Dome
Sea stateSea state: moderate
The waves you may find
- Most commonMost common2.1 ft
- Significant4.2 ft
- Highest expectedHighest8.6 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 8.6 ft. Before heading out, expect waves of up to 8.6 ft.
Wind on the coast and offshore
Cross-offshore wind. The coast faces northwest and the wind comes off the land at an angle: calmer water near the shore, and bait and boats drift out to sea.
Wave height, next 7 daysWaves, next 7 days
Waves build over the next few days. The biggest waves arrive on Sunday 1: 9.5 ft with a period of 7 s, from the northwest (rough).
Water temperature
Water temperature →Water temperature changes how fish behave: in very cold or very warm water they feed less. The water cools over the next few days: about 53.5 °F by Wednesday 4.
Water about normal for late October.
Satellite: NASA MUR (JPL MUR MEaSUREs, PO.DAAC), doi:10.5067/GHGMR-4FJ04. Sources and licenses
Water temperature →Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 3:36 pm (local time).
Surf in Wakkanai Breakwater Dome today
Surf today
Fair- 2.1–3.2 ft surf at the shore, a fun size for most surfers
- 3.0 ft swell at 5 s from the northwest, short: weak, messy waves
- Light offshore wind (7 mph): it holds up and grooms the waves
- Rising tide
- Light: First light 5:37 am · sunrise 6:08 am · sunset 4:26 pm · last light 4:56 pm
- Tide: high 3:13 am (1.3 ft) and low 12:06 pm (0.2 ft). Every break has its own tide: some work at low tide and others at high tide. The tide doesn’t change the score here.
- Water at 55.4 °F: a 5/4 fullsuit with booties (and a hood if it’s windy).
- Energy: 37 kJ · Low power
Today’s surf at a glance
The best window, 1:00 pm to 4:56 pm, has a good size and light offshore wind, though with a short-period swell.
An estimate for this stretch of coast, not for a specific break: every beach or reef works its own way (its tide, bottom and angle). Check it when you get there.
Follow the flags and the lifeguards, and don’t paddle out if the surf is above your level: this score is a guide, not a substitute for what you see when you get there.
Diving in Wakkanai Breakwater Dome today
Diving and snorkeling today
Likely visibility: poor- Slack water around low tide (12:06 pm): little current from 11:40 am to 12:40 pm
- 3.4 ft swell at 5 s from the north-northwest: some surge on the bottom
- Light cross-shore wind (7 mph)
- 0.4 mph current toward the southeast, weak (model)
- Sun high: more light underwater
- Slack water today: high tide 3:13 am (2:20–3:40 am) and low tide 12:06 pm (11:40 am–12:40 pm)
- Likely visibility: poor. Swell (up to 5.9 ft at 7 s) and rain (0.94 in) over the last few days have stirred up the water. Based on the last 24 hours of data.
- Water at 55.4 °F: a 7 mm semi-dry suit, with hood, gloves and booties.
- Snorkeling: better not, with these waves, wind or current.
- Night dive: dark from 4:56 pm. Waning gibbous (88%), rising at 6:08 pm: a bright night.
Your diving day at a glance
The best window, 11:10 am to 1:40 pm, combines slack water at low tide, light wind, weak current and the sun high, though with some swell.
Slack water comes from the tide: in inlets, channels and between islands the water can keep running for an hour or two after. Ask the local dive shop.
Never dive alone and check with the local dive shop: this rating is a guide, not a substitute for a professional.
Dive sites, wrecks and dive shops nearby
We have no dive sites, dive shops or wrecks on record within 12 mi of Wakkanai Breakwater Dome.
If you know one, you can add it to OpenStreetMap and it will show up here after the next update. Missing one? Add it to OpenStreetMap
Sites: © OpenStreetMap contributors (ODbL).
Weather in Wakkanai Breakwater Dome
Now in Wakkanai Breakwater Dome
- Low / high
- 34 / 43 °F
- Rain
- 0.88 in · 100%
- Clouds
- 100%
- Humidity
- 96%
- Dew pointDew point
- 40 °F
- Visibility
- 0.3 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 33
- Saharan dust
- No
Pressure and fishing
- ↗ RisingRising Anglers say fish bite less for a while
- → SteadySteady Anglers expect normal activity
- ↘ FallingFalling · now Anglers say fish feed more before the change
Falling now (−0.05 inHg in 3 hours). Over the next 48 hours: −0.48 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.
Today, hour by hourHour by hour
Bars: mean wind. Dashed line: gusts. Arrows point where the wind blows to.
| Time | 12:00 am | 3:00 am | 6:00 am | 9:00 am | 12:00 pm | 3:00 pm | 6:00 pm | 9:00 pm |
|---|---|---|---|---|---|---|---|---|
| Sky | Light snow | Light snow | Light snow | Overcast | Light drizzle | Drizzle | Rain | Light rain |
| Temperature | 35° | 34° | 36° | 40° | 40° | 41° | 42° | 43° |
| Wind (mph) | 16 WNW | 16 WNW | 14 W | 14 W | 7 WSW | 8 S | 10 SSE | 15 S |
| Gusts | 30 | 32 | 28 | 27 | 19 | 15 | 20 | 26 |
| Waves | 7.9 ft | 7.5 ft | 7.1 ft | 6.3 ft | 5.1 ft | 4.1 ft | 4.4 ft | 5.1 ft |
| Rain | 0.01 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.03 in | 0.14 in | 0.09 in |
- 3:00 pm 41° 8 S 4.1 ft
- 6:00 pm 42° 10 SSE 4.4 ft
- 9:00 pm 43° 15 S 5.1 ft
- 12:00 am 43° 10 S 4.8 ft
- 3:00 am 46° 9 SSW 4.1 ft
- 6:00 am 48° 11 S 3.6 ft
- 9:00 am 50° 11 S 3.9 ft
- 12:00 pm 55° 16 SSW 4.8 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 34 / 43 °F | 16 mph WSW | 7.9 ft | 3:13 am | |
| Fri 30 | 43 / 55 °F | 17 mph SSW | 4.8 ft | 3:08 am | |
| Sat 31 | 37 / 54 °F | 17 mph W | 7.0 ft | 3:14 am | |
| Sun 1 | 35 / 38 °F | 24 mph WNW | 9.5 ft | 3:41 am | |
| Mon 2 | 37 / 45 °F | 11 mph WSW | 5.2 ft | 4:15 am | |
| Tue 3 | 36 / 40 °F | 15 mph WNW | 4.1 ft | 4:51 am | |
| Wed 4 | 35 / 38 °F | 17 mph WNW | 5.6 ft | 11:11 am | |
| Thu 5 | 37 / 50 °F | 15 mph S | 4.5 ft | 2:32 am · 12:48 pm | |
| Fri 6 | 34 / 49 °F | 15 mph NW | 7.7 ft | 1:38 am · 2:09 pm | |
| Sat 7 | 30 / 34 °F | 19 mph WNW | 9.0 ft | 1:34 am · 3:22 pm | |
| Sun 8 | 30 / 32 °F | 18 mph W | 9.2 ft | 1:30 am | |
| Mon 9 | 30 / 32 °F | 9 mph W | 4.6 ft | 1:26 am | |
| Tue 10 | 30 / 34 °F | 9 mph NW | 3.5 ft | 1:34 am | |
| Wed 11 | 30 / 32 °F | 9 mph WNW | 4.1 ft | 1:53 am |
- Fri 30 Heavy drizzle 43° / 55° 4.8 ft
- Sat 31 Light snow 37° / 54° 7.0 ft
- Sun 1 Snow 35° / 38° 9.5 ft
- Mon 2 Light drizzle 37° / 45° 5.2 ft
- Tue 3 Light snow 36° / 40° 4.1 ft
- Wed 4 Light snow 35° / 38° 5.6 ft
- Thu 5 Drizzle 37° / 50° 4.5 ft
Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.
- The models They don't agree · low confidence: unsure about wind on Saturday 31. See the models →
- Outlook Next few weeks, compared with normal: a bit cooler and normal rain. See the outlook →
- Normal Today, cooler than normal for late October (−8.2 °F; normal high: 51 °F). Climate by month →
Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 3:36 pm (local time).
The sun in Wakkanai Breakwater Dome
Sunrise and sunset
- First light 5:02 am
- Full dark 5:31 pm
- Civil dawn 5:37 am
- Civil dusk 4:56 pm
- Solar noon 11:17 am (31° high)
- Daylight 10 h 18 min (−3 min)
- Evening golden hour 3:44 pm
- Full dark 5:31 pm
Golden hour and the day-night map
Today the sun is 92,345,083 mi away and looks 32′ 11″ across.
The moon in Wakkanai Breakwater Dome
Moon phase and position
Today the moon is 226,480 mi away and looks 32′ 46″ across.
Solunar periods
Today's activity: medium- 12:33–2:33 am Major · the moon passes overhead · high activity
- 1:05–3:05 pm Major · the moon passes underfoot · high activity
- 9:30–10:30 am Minor · moonset · medium activity
- 5:38–6:38 pm Minor · moonrise · medium activity
According to solunar theory, fish feed more when the moon passes overhead or underfoot (major periods, about 2 h) and when it rises or sets (minor periods, 1 h). It works best around new and full moon.
Upcoming moon phases
2026 moon calendar →- Last quarter Mon, Nov 2 · 5:29 amNov 2 in 4 days
- New moon Mon, Nov 9 · 4:03 pmNov 9 in 11 days
- First quarter Tue, Nov 17 · 8:48 pmNov 17 in 19 days
- Full moon Tue, Nov 24 · 11:54 pmNov 24 in 26 days
Perigee on October 29, 226,426 mi away, coinciding with the spring tides from October 27 to 29: they will be stronger than usual.
Where to fish in Wakkanai Breakwater Dome
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetty 0.5 mi
- Jetty 0.5 mi
- Jetty 0.9 mi
- Jetty 0.9 mi
- Jetty 1.1 mi
- Jetty 1.3 mi
- Jetty 1.5 mi
- Jetty 1.7 mi
- Jetty 2.6 mi
- Jetty 3.6 mi
- Port of Wakkanai 0.2 mi
- アイザ釣具店 1.5 mi
Within 9.3 mi. A spot may be missing or closed. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Spots: © OpenStreetMap contributors (ODbL) and Overture Maps.
Water depth
Shallow, gradualShallow, gradual bottom: you need to go 1.3 mi out for 33 ft of water.
From the shoreline out to sea, heading north.
How far from shore
- 16 ft deep0.35 mi
- 33 ft deep1.3 mi
- 66 ft deep1.8 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 0.35 mi): cast far from the beach and fish the high tide, when there is more water close in.
- Swimming. The water gets deeper little by little, but a few dozen yards out you can no longer stand.
- Diving. Shallow near shore: you only reach 33 ft at 1.3 mi. For dives deeper than 33 ft, go by boat.
Rough estimate: here the data comes in cells of about 0.3 mi and misses details near shore (rocks, sandbars, small coves). The profile is turned slightly from the coast so it does not run into an island or a headland.
Source: NOAA ETOPO 2022 (CC0), cells of about 0.3 mi; depth below mean sea level. For reference only: not for navigation or anchoring.
Nearest lighthouse
Wakkanai Lighthouse 2.7 mi northwest
- Light
- 2 white flashes every 20 s · Fl(2) W 20s
- Range
- 18 nautical miles (21 mi)
- Light height
- 138 ft above sea level
- Tower height
- 140 ft
- Built
- 1900
Light details: NGA List of Lights (USA); the rest from Wikidata. For reference only: not for navigation. Wikipedia · Wikidata · Sources and licenses
Tides near Wakkanai Breakwater DomeTides nearby
- Wakkanai0.8 mi
- Wakkanai Kō0.8 mi
- Hagimi2.4 mi
- Asahi2.9 mi
- Sakanoshita3.2 mi
- Koetoi3.7 mi
- Makubetsu7.6 mi
- Bakkai8.1 mi
- Oshidomari26 mi
- Kafukamura32 mi
Wakkanai Breakwater Dome at a glance
- Pier. Coordinates: 45.420° N, 141.680° E.
- It is 256 mi north of Hakodate, the main place in Hokkaido. The sun rises 3 min later and sets 10 min earlier than in Hakodate.
- In Wakkanai, 0.8 mi from the center.
- The nearest tide station, Wakkanai, is 0.9 mi to the south.
- Its coast faces northwest.
- Beaches and harbors nearby: Wakkanai Port Hokuyo Wharf (0.7 mi), Wakkanai Kō (0.8 mi), Suehiro Wharf (1.1 mi), Wakkanai Port Lumber Pier (1.1 mi).
Questions about Wakkanai Breakwater DomeQuestions
Where is Wakkanai Breakwater Dome?
A breakwater in Wakkanai, 0.8 mi from the center, Hokkaido (Japan). The coast faces northwest.
Can you fish at Wakkanai Breakwater Dome?
OpenStreetMap doesn't say whether fishing is allowed. Check the rules on site and the local fishing license: they can change.
What time is high tide today in Wakkanai Breakwater Dome?
Today in Wakkanai Breakwater Dome there is high tide at 3:13 am (1.3 ft) and low tide at 12:06 pm. Tide coefficient 108.
What time is sunset today in Wakkanai Breakwater Dome?
At 4:26 pm. There is light until the end of civil twilight, at 4:56 pm.
What time is sunrise tomorrow in Wakkanai Breakwater Dome?
At 6:09 am. First light comes at 5:04 am.
What phase is the moon today?
Waning gibbous, 88% illuminated. New moon on Mon, Nov 9 · 4:03 pm.
When are the next spring tides?
From October 27 to 29, together with the lunar perigee: they will be stronger than usual.
What are today's solunar periods?
Major 12:33–2:33 am, Minor 9:30–10:30 am, Major 1:05–3:05 pm, Minor 5:38–6:38 pm. Today's activity is medium.
What's the weather like today in Wakkanai Breakwater Dome?
Light snow, from 34 °F to 43 °F, with a gentle breeze from the south (8 mph) and a 100% chance of rain.
How is the sea today in Wakkanai Breakwater Dome?
Moderate (Douglas 4): 4.2 ft waves with a period of 5.8 s from the west-northwest. The water is 55.4 °F.
When is the best time to visit Wakkanai Breakwater Dome?
The best time to visit Wakkanai Breakwater Dome is from July to August: highs of 69 °F to 73 °F, about 10 rainy days a month and 5 hours of sunshine a day.
Can I use this data for navigation?
No. These are predictions for fishing and leisure; for navigation, use the official publications.
Where this data comes from
Tide: Wakkanai station, with constants from TICON-4 (Hart-Davis, Dettmering and Seitz, 2025, SEANOE), licensed CC BY 4.0, via Slackwater database (changes). Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).