Den Helder tides today
- Tide now 5.8 ft ↑ rising · high 10:40 am (6.4 ft)
- Best time to fish 3:10–5:10 pm average day · 6/10
- Beach day Not today Not a beach day · 0/10
- Waves · water 2.2 ft · 56 °F slight · 4.5 s from the west
- Wind · air 1 mph · 55 °F from the WSW, gusts 3 · partly cloudy
- Sun 7:33 am–5:16 pm 9 h 43 min of daylight
- Moon 85% · 6:50 pm waning gibbous · rises at 6:50 pm
- Best time to dive 7:30–10:30 am great day · 9/10
Today in Den Helder there are high tides at 10:40 am (6.4 ft) and 10:47 pm (6.4 ft) and low tides at 3:53 am and 4:12 pm. Tide coefficient 74. Right now the tide is rising toward the high tide at 10:40 am. The sun rises at 7:33 am and sets at 5:16 pm: 9 h 43 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 6:50 pm. Major solunar periods run from 2:05 am to 4:05 am and from 2:38 pm to 4:38 pm. The next spring tides arrive from November 9 to 11. The sea is slight, with 2.2 ft waves. There's a light air from the west-southwest (1 mph). Partly cloudy, 55 °F.
Fishing in Den Helder today
Best time to fish
Solunar activity today: medium- Low tide at 3:53 am
- Major period 2:05–4:05 am
- Rising pressure (+0.19 inHg in 24 h), light onshore wind (4 mph) and some swell (2.9 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 74 (average tides)
- A major period lines up with sunset
Your day at a glance
The best window, 2:50 am to 3:30 am, combines the 3:53 am low tide, a major period, a light onshore breeze and some swell, though with rising pressure. Also worth a try from 3:10 pm to 5:10 pm, with the 4:12 pm low tide, a major period and sunset, though with rising pressure.
Species with the most records nearby: European flounder, European plaice, garfish and whiting. October is one of the months when these are seen most: whiting and common sole. What you can catch
Beach day in Den Helder
Is it a beach day?
- Sun and clouds
- Almost no wind
- Calm for swimming: 2.2 ft waves
- Low tide at 4:12 pm: more sand
- Feels like 58 °F: chilly for the beach
- Water at 57 °F (very cold)
Today, hour by hour
- Swimming Calm · 2.2 ft
2.2 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 57 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 2 mph
Almost no wind.
- Tide & sand 4:12 pm
Low tide at 3:53 am and 4:12 pm: that's when there's the most sand. High tide at 10:40 am and 10:47 pm.
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 Den Helder
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Naaktstrand Den Hoorn 4.0 mi · NW
- Parking
- Clothing-optional area
- Strand Julianadorp 4.8 mi · SW
- Lifeguard
- Restrooms
Excellent water quality 2025 season, EEA
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL). Bathing water quality: European Environment Agency (EEA), with data from the authorities of the Netherlands.
Webcams near Den Helder
Webcams provided by windy.com — add a webcam
Tides in Den Helder
Today's high and low tides
- ▼ Low tide 3:53 am 1.6 ft
- ▲ Next high tide 10:40 am 6.4 ft · coef. 74
- ▼ Low tide 4:12 pm 2.1 ft
- ▲ High tide 10:47 pm 6.4 ft · coef. 72
↑ Rising The tide is rising. 2 h 18 min to high tide at 10:40 am.
Tide coefficient 74 for the 10:40 am high tide and 72 for the 10:47 pm high tide. Average coefficient. The water rises and falls 4.8 ft between the highest high and the lowest low: an average 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 December 28 (7.4 ft) and the lowest, on March 22 (0.4 ft).
Semidiurnal: two high and two low tides a day, of similar height.
Heights above chart datum: the lowest astronomical tide (LAT), the zero of nautical charts in Europe. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. chart datum (LAT)
Tide coefficient and range in October
The biggest tides of the month came from October 9 to 11 (coefficient 85, 6.2 ft range). The smallest, from October 20 to 21 (coefficient 51, 3.3 ft).
Tide and solunar table · this week
| Day | Sun | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|---|---|
| Today, Thu 29 | 7:33 am · 5:16 pm | Low tide 3:53 am · 1.6 ft | High tide 10:40 am · 6.4 ft | Low tide 4:12 pm · 2.1 ft | High tide 10:47 pm · 6.4 ft | Coef. 74 | 85% | Major periods 2:05 am · 2:38 pm | Medium |
| Fri 30 | 7:35 am · 5:14 pm | Low tide 4:36 am · 1.7 ft | High tide 11:17 am · 6.0 ft | Low tide 4:49 pm · 2.2 ft | High tide 11:20 pm · 6.5 ft | Coef. 71 | 76% | Major periods 3:10 am · 3:42 pm | Medium |
| Sat 31 | 7:36 am · 5:12 pm | Low tide 5:21 am · 1.8 ft | High tide 11:48 am · 5.7 ft | Low tide 5:29 pm · 2.3 ft | High tide 11:57 pm · 6.6 ft | Coef. 68 | 66% | Major periods 4:13 am · 4:43 pm | Medium |
| Sun 1 | 7:38 am · 5:10 pm | Low tide 6:11 am · 2.0 ft | High tide 12:20 pm · 5.4 ft | Low tide 6:14 pm · 2.4 ft | — | Coef. 63 | Last quarter | Major periods 5:12 am · 5:40 pm | Medium |
| Mon 2 | 7:40 am · 5:08 pm | High tide 12:43 am · 6.6 ft | Low tide 7:10 am · 2.3 ft | High tide 1:02 pm · 5.1 ft | Low tide 7:09 pm · 2.4 ft | Coef. 61 | 43% | Major periods 6:06 am · 6:31 pm | Medium |
| Tue 3 | 7:42 am · 5:06 pm | High tide 1:40 am · 6.6 ft | Low tide 8:21 am · 2.4 ft | High tide 1:59 pm · 5.0 ft | Low tide 8:16 pm · 2.4 ft | Coef. 56 | 33% | Major periods 6:56 am · 7:19 pm | Medium |
| Wed 4 | 7:44 am · 5:04 pm | High tide 2:51 am · 6.6 ft | Low tide 9:41 am · 2.3 ft | High tide 4:40 pm · 5.1 ft | Low tide 9:36 pm · 2.3 ft | Coef. 61 | 23% | Major periods 7:42 am · 8:04 pm | Medium |
▲ high tide · ▼ low tide · heights above chart datum (LAT). Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Where this tide comes from
Den Helder has no station of its own, so we use the tide at Oudeschild (TICON-4), 6.6 mi away. On the open coast the difference is usually a few minutes and inches; inside estuaries, rivers and enclosed bays it can be much larger.
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 Den Helder
Sea stateSea state: slight
The waves you may find
- Most commonMost common1.1 ft
- Significant2.2 ft
- Highest expectedHighest4.6 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 4.6 ft. Before heading out, expect waves of up to 4.6 ft.
Wind on the coast and offshore
Cross-onshore wind. The coast faces west and the wind comes in from the sea at an angle: a bit more surf at the shore and drift along the coast, toward land.
Wave height, next 7 daysWaves, next 7 days
Waves build over the next few days. The biggest waves arrive on Monday 2: 5.8 ft with a period of 6 s, from the north (moderate).
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 54.7 °F by Wednesday 4.
Water warmer than normal for late October (+1.4 °F).
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 8:22 am (local time).
Nearest buoy
This is a real measurement of the sea, not a forecast. Data from Rijkswaterstaat Water, Traffic and Environment, via the E.U. Copernicus Marine Service. Generated using E.U. Copernicus Marine Service Information (doi:10.48670/moi-00036).
Surf in Den Helder today
Surf today
Poor- 1.2–1.9 ft surf at the shore, small: good for learning or a longboard
- 1.8 ft swell at 4 s from the west-northwest, short: weak, messy waves
- Almost no wind (1 mph): glassy water
- First or last light of the day
- Rising tide (high tide at 10:40 am)
- Light: First light 6:57 am · sunrise 7:33 am · sunset 5:16 pm · last light 5:52 pm
- Tide: low 3:53 am (1.6 ft), high 10:40 am (6.4 ft), low 4:12 pm (2.1 ft) and high 10:47 pm (6.4 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 56.3 °F: a 5/4 fullsuit with booties (and a hood if it’s windy).
- Energy: 7 kJ · Low power
Today’s surf at a glance
The best window, 7:00 am to 11:00 am, has glassy water, though with a short-period swell. 4:00 pm to 5:52 pm can also work, with glassy water, though with small waves and 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 Den Helder today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (10:40 am): little current from 10:00 am to 11:00 am
- 1.7 ft swell at 4 s from the west-northwest: some surge on the bottom
- Almost no wind
- 0.3 mph current toward the south, weak (model)
- Daylight
- Slack water today: low tide 3:53 am (3:38–4:08 am), high tide 10:40 am (10:00–11:00 am), low tide 4:12 pm (3:57–4:27 pm) and high tide 10:47 pm (9:20–11:10 pm)
- Likely visibility: good. Swell (up to 3.1 ft at 5 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 56.3 °F: a 7 mm semi-dry suit, with hood, gloves and booties.
- Snorkeling: doable, with some waves or wind.
- Night dive: dark from 5:52 pm. Waning gibbous (85%), rising at 6:50 pm: a bright night.
Your diving day at a glance
The best window, 7:30 am to 10:30 am, combines slack water at high tide, light wind and weak current. Also worth a look from 3:50 pm to 4:30 pm, with slack water at low tide, little swell and light wind, though with current.
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
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- T 61 1.0 mi
- L 9506 1.3 mi
- Schietschifj 2.5 mi
- Wreck 0.7 mi
- Wreck 0.9 mi
- Wreck 1.7 mi
- Wreck 1.8 mi
- Noorderhaaks 3.1 mi
- Mosselgaatje 4.3 mi
- Onderwatersportvereniging De Aquanauten 0.8 mi
- Duikcentrum Den Helder 1.0 mi
- Zeus Faber 5.4 mi
Within 12 mi. Some may be missing or closed; marine reserves usually need a permit. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Wreck and reef positions are approximate and not for navigation; a wreck’s depth runs from the top of the hull to the seabed.
Sites: © OpenStreetMap contributors (ODbL). Wrecks: EMODnet Human Activities (AND-International), from UK Hydrographic Office data, CC BY 4.0. Contains public sector information licensed under the Open Government Licence v3.0.
Weather in Den Helder
Now in Den Helder
- Low / high
- 51 / 59 °F
- Rain
- 0.00 in · 67%
- Clouds
- 80%
- Humidity
- 91%
- Dew pointDew point
- 52 °F
- Visibility
- 13 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 31
- Saharan dust
- No
- Pollen
- None
Pressure and fishing
- ↗ RisingRising · now Anglers say fish bite less for a while
- → SteadySteady Anglers expect normal activity
- ↘ FallingFalling Anglers say fish feed more before the change
Rising now (+0.03 inHg in 3 hours). Over the next 48 hours: +0.18 inHg. Rising pressure: anglers say fish bite less for a while. 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 | Overcast | Overcast | Overcast | Partly cloudy | Partly cloudy | Partly cloudy | Partly cloudy | Partly cloudy |
| Temperature | 56° | 55° | 55° | 55° | 58° | 59° | 55° | 52° |
| Wind (mph) | 7 WSW | 4 WSW | 2 WSW | 1 SSW | 2 WNW | 2 NW | 3 ESE | 3 ESE |
| Gusts | 13 | 11 | 4 | 2 | 4 | 5 | 5 | 5 |
| Waves | 3.2 ft | 2.9 ft | 2.5 ft | 2.2 ft | 1.8 ft | 1.6 ft | 1.4 ft | 1.3 ft |
| Rain | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 9:00 am 55° 1 SSW 2.2 ft
- 12:00 pm 58° 2 WNW 1.8 ft
- 3:00 pm 59° 2 NW 1.6 ft
- 6:00 pm 55° 3 ESE 1.4 ft
- 9:00 pm 52° 3 ESE 1.3 ft
- 12:00 am 51° 3 ESE 1.2 ft
- 3:00 am 50° 3 SE 1.0 ft
- 6:00 am 48° 4 ESE 1.0 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 51 / 59 °F | 7 mph SW | 3.2 ft | 10:40 am · 10:47 pm | |
| Fri 30 | 48 / 52 °F | 6 mph ESE | 1.2 ft | 11:17 am · 11:20 pm | |
| Sat 31 | 48 / 53 °F | 7 mph ESE | 0.8 ft | 11:48 am · 11:57 pm | |
| Sun 1 | 50 / 55 °F | 7 mph NW | 4.1 ft | 12:20 pm | |
| Mon 2 | 52 / 54 °F | 16 mph N | 5.8 ft | 12:43 am · 1:02 pm | |
| Tue 3 | 48 / 53 °F | 15 mph NE | 5.3 ft | 1:40 am · 1:59 pm | |
| Wed 4 | 42 / 53 °F | 4 mph ESE | 3.6 ft | 2:51 am · 4:40 pm | |
| Thu 5 | 41 / 51 °F | 5 mph E | 1.8 ft | 4:34 am · 5:41 pm | |
| Fri 6 | 45 / 52 °F | 4 mph E | 1.3 ft | 5:47 am · 6:29 pm | |
| Sat 7 | 39 / 48 °F | 6 mph ESE | 1.1 ft | 6:39 am · 7:12 pm | |
| Sun 8 | 39 / 50 °F | 5 mph S | 0.7 ft | 7:25 am · 7:52 pm | |
| Mon 9 | 47 / 54 °F | 7 mph SSE | 1.0 ft | 8:07 am · 8:30 pm | |
| Tue 10 | 51 / 57 °F | 15 mph S | 2.0 ft | 8:46 am · 9:06 pm | |
| Wed 11 | 51 / 56 °F | 11 mph SSE | 1.6 ft | 9:21 am · 9:39 pm |
- Fri 30 Fog 48° / 52° 1.2 ft
- Sat 31 Overcast 48° / 53° 0.8 ft
- Sun 1 Light rain 50° / 55° 4.1 ft
- Mon 2 Light rain 52° / 54° 5.8 ft
- Tue 3 Light drizzle 48° / 53° 5.3 ft
- Wed 4 Light drizzle 42° / 53° 3.6 ft
- Thu 5 Overcast 41° / 51° 1.8 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.
- Normal Today, warmer than normal for late October (+4.5 °F; normal high: 54 °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 8:22 am (local time).
The sun in Den Helder
Sunrise and sunset
- First light 6:16 am
- Full dark 6:32 pm
- Civil dawn 6:57 am
- Civil dusk 5:52 pm
- Solar noon 12:25 pm (24° high)
- Daylight 9 h 43 min (−4 min)
- Evening golden hour 4:25 pm
- Full dark 6:32 pm
Golden hour and the day-night map
Today the sun is 92,335,869 mi away and looks 32′ 11″ across.
The moon in Den Helder
Moon phase and position
Today the moon is 226,618 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 2:05–4:05 am Major · the moon passes overhead · high activity
- 2:38–4:38 pm Major · the moon passes underfoot · high activity
- 11:54 am–12:54 pm Minor · moonset · medium activity
- 6:20–7:20 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 Sun, Nov 1 · 9:29 pmNov 1 in 3 days
- New moon Mon, Nov 9 · 8:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 12:48 pmNov 17 in 19 days
- Full moon Tue, Nov 24 · 3:54 pmNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Den Helder
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Steiger 42a 0.9 mi
- Steiger 42b 0.9 mi
- Jetty 0.3 mi
- Wierhoofd 0.9 mi
- Boat ramp 1.2 mi
- Boat ramp 1.3 mi
- Zeevisvereniging 't Kuitje 2.2 mi
- Jachthaven Willemsoord 0.5 mi
- Watersportvereniging "Helder - Willemsoord - Nieuwediep" (wsvhwn) 0.9 mi
- Hengelsport Den Helder 0.6 mi
- Rhino Hengelsport 1.1 mi
- Fuel dock 0.5 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
Drops off fastThe bottom drops off fast: the water is 33 ft deep just 100 ft from shore.
From the shoreline (1.1 mi from Den Helder) out to sea, heading west.
How far from shore
- 16 ft deep50 ft
- 33 ft deep100 ft
- 66 ft deep500 ft
- 164 ft deepnot within 1.9 mi
For fishing, swimming and diving
- Shore fishing. Deep water close in: about 55 ft just 330 ft out. Good for casting from rocks, jetties or the beach itself; current and surf hit harder here.
- Swimming. The bottom drops quickly near the shore and you are soon out of your depth. Keep an eye on kids and weak swimmers.
- Diving. Shore diving works here: 33 ft at 100 ft and 66 ft at 500 ft from shore.
There is land ahead (an island, a headland or the far shore) 1.9 mi out. Right by the shore the bottom may drop even faster than shown. Where the bottom comes up to the surface there are shoals, rocks or an islet next to the profile.
Source: EMODnet Bathymetry DTM 2024 (CC BY 4.0), cells of about 380 ft; depth at the lowest astronomical tide. For reference only: not for navigation or anchoring.
Nearest lighthouse
Lange Jaap 1.4 mi west
- Light
- 4 white flashes every 20 s · Fl(4) W 20s
- Range
- 30 nautical miles (35 mi)
- Light height
- 187 ft above sea level
- Tower height
- 208 ft
- Built
- 1878
Other lighthouses nearby: Groote Kaap (5.8 mi south).
Light details: NGA List of Lights (USA); the rest from Wikidata. For reference only: not for navigation. Wikipedia · Wikidata · Sources and licenses
Tides near Den HelderTides nearby
- Huisduinen1.5 mi
- Friese Buurt2.7 mi
- De Kooy3.5 mi
- Den Hoorn4.5 mi
- Julianadorp4.9 mi
- Breezand5.2 mi
- Oudeschild6.6 mi
- Van Ewijcksluis7.1 mi
- Westerland8.4 mi
- Callantsoog8.7 mi
Den Helder at a glance
- Town or city of about 59,569 people. Coordinates: 52.960° N, 4.759° E.
- It is 31 mi north of Heemskerk, the main place in North Holland. The sun rises 1 min later and sets 2 min earlier than in Heemskerk.
- The nearest tide station, Oudeschild, is 6.6 mi to the northeast.
- Its coast faces west.
- Beaches and harbors nearby: Nieuwe Haven (1.2 mi), Marinehaven Willemsoord (1.2 mi), Strandslag Huisduinen (1.9 mi), Onrust (2.5 mi).
Questions about Den HelderQuestions
What time is high tide today in Den Helder?
Today in Den Helder there are high tides at 10:40 am (6.4 ft) and 10:47 pm (6.4 ft) and low tides at 3:53 am and 4:12 pm. Tide coefficient 74.
What time is sunset today in Den Helder?
At 5:16 pm. There is light until the end of civil twilight, at 5:52 pm.
What time is sunrise tomorrow in Den Helder?
At 7:35 am. First light comes at 6:18 am.
What phase is the moon today?
Waning gibbous, 85% illuminated. New moon on Mon, Nov 9 · 8:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 2:05–4:05 am, Minor 11:54 am–12:54 pm, Major 2:38–4:38 pm, Minor 6:20–7:20 pm. Today's activity is medium.
What's the weather like today in Den Helder?
Overcast, from 51 °F to 59 °F, with a light air from the west-southwest (1 mph) and a 67% chance of rain.
How is the sea today in Den Helder?
Slight (Douglas 3): 2.2 ft waves with a period of 4.5 s from the west. The water is 56.3 °F.
When is the best time to visit Den Helder?
The best time to visit Den Helder is from July to August: highs of 70 °F, about 11 rainy days a month and 7 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: Oudeschild 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).