SlackDiver – Optimal tides on UK wrecks

Select sites, filters, and view slack water windows.

Disclaimer

Please read the Terms before using this service.

By continuing, you acknowledge that all information provided is for general guidance only and may contain inaccuracies or omissions, and change without notice. No guarantees of accuracy, completeness, or reliability are given. To the fullest extent permitted by UK law, the creator accepts no liability for financial or reputational loss, damage to property, or personal or third‑party injury or death arising directly or indirectly from the use of this tool.

Master the Tides : Dive with Confidence

Discover optimal diving times with SlackDiver. Utilising precise tidal analysis, we provide the perfect windows for SCUBA diving on wrecks around the UK, which can help you plan safer and unforgettable underwater adventures.

Knowing the slack water times at locations around the UK is also very valuable for sea anglers and yachtsmen. Everyone at sea has to travel somewhere, and that's either with the tide or against it.

Plan Your Dives with Three Time Horizons

Weekly / Week Ahead

  • Use case: Tactical planning for the next few days.
  • Benefit: Highest accuracy since weather forecasts are usable at this scale.
  • Audience: Active divers, charter operators, anglers.
  • Make immediate plans — “this Saturday at 14:20”.
  • Check back often.

Monthly / Month Ahead

  • Use case: Medium‑term scheduling for clubs, courses, and wreck trips.
  • Benefit: Supports booking logistics (boats, accommodation, leave).
  • Caveat: Weather uncertainty grows, but tidal windows remain predictable.
  • Audience: Organisers, dive schools, expedition planners.
  • Gives confidence for planning even when weather is unknown.

Annual / Year Ahead

  • Use case: Strategic planning for expeditions, holidays, and major events.
  • Benefit: Tidal cycles are deterministic — publish the year ahead.
  • Caveat: Weather is unknowable this far out; focus is tidal feasibility.
  • Audience: Expedition leaders, tourism operators, divers planning annual leave.
  • Helps identify “prime weekends” and rare slack windows at specific wrecks.

Plan your journey with SlackDiver

Pricing to be determined - free for now!

Features

Check out the options

  • Sites
  • Day Range
  • Date Range
  • Tide Type
  • Speed Thresholds
  • Daylight hours
  • Time selection
  • Persistence

Free

Great for casual users

  • 1 site at a time
  • Weekends
  • 1 month date range
  • Low tides
  • Fixed speed thresholds
  • Daylight hours only
  • Default time selection
  • Session‑only settings

Features

Check out the options

  • Sites
  • Day Range
  • Date Range
  • Tide Type
  • Speed Thresholds
  • Daylight hours
  • Time selection
  • Persistence

Registered

Unlock full control

  • Multiple sites + favorites
  • Full week (weekday + weekend)
  • 1 year date range
  • Low + high tides
  • Custom speed sliders
  • Custom hours + sunrise/sunset
  • Interactive time slider
  • Saved settings

Premium (planned)

Extend your options

  • Extend the dive window
  • View other data (water level, direction of flow)
  • Add your own preferred sites
  • Smart tide sliders
  • Site‑specific slack percentages
  • Sync settings across devices
  • Club or group membership for a limited set of sites

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Selection and Filters

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Terms & Conditions

Accuracy & Reliability of Information

  • All tidal predictions, timings, and related data are provided for general guidance.
  • The data may contain errors, omissions, or delays.
  • Environmental conditions (weather, currents, visibility) can change rapidly and unpredictably.
  • All users must verify information independently before acting on it.

No Professional Advice

  • SlackDiver does not provide navigation, safety, or operational advice.
  • The tool is not a substitute for official tide tables, charts, or professional training.
  • Users are responsible for their own dive planning, safety checks, and risk assessments.

“We’re a tool, not a skipper.” Please ensure you are properly trained and competent to make use of it.

Limitation of Liability

  • SlackDiver accepts no responsibility for financial or reputational loss, property damage, injury, or death.
  • This applies whether the loss is direct, indirect, or consequential.
  • This tool is provided under the protection of the fullest extent permitted by UK law.
  • Users accept all risks associated with diving and marine activities.

Acceptance of Terms

  • Using the site constitutes acceptance of the Terms.
  • Continued use after updates also constitutes acceptance.
  • Users must stop using the service if they do not agree.

Service Status & Availability

  • The service is under active development.
  • Data may be experimental or incomplete.
  • Availability may change, and outages may occur.

User Responsibility

  • Users must make their own safety decisions.
  • Users must follow local laws, diving standards, and maritime regulations.
  • Users must use official sources for navigation and safety‑critical planning.

Indemnity

Users agree not to hold the creator responsible for claims arising from their use of the tool.

Intellectual Property

All SlackDiver branding, code, and content belongs to SlackDiver. Publication or commercial use requires written authorisation.

Changes to the Service

SlackDiver may update or withdraw features at any time.

Governing Law

The SlackDiver software, and use as a tool, is governed by UK law.

Privacy Policy

Your Privacy Policy content here.