Disclaimer

General Disclaimer

The information provided by WorkHarbor (“https://www.workharbor.com”) is for general informational and educational purposes only. All information on the site is provided in good faith; however, we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability, or completeness of any information on the site.

The use of any information or tools from this website is entirely at your own risk, for which we shall not be liable. It is your responsibility to ensure that any information or tool available through this website meets your specific requirements and the circumstances of your vessel, voyage, or shore role.

Verify With the Ship and Official Sources

Maritime guidance, calculator results, and technical information on WorkHarbor are informational only and may be incomplete or out of date. Real-world outcomes vary with the vessel, her loading and trim, the weather and sea state, current and tide, traffic and routeing, and the rules of the flag and port states, and standards change over time. Before you make any decision that affects a passage, the safety of a ship, the handling of cargo, or a seafarer’s certification, you should use your own professional judgment and verify the figures with the ship’s master and officers, your company or ship manager, the classification society, and your maritime administration. Charts, tonnage certificates, stability books, and sea-service records are the authorities; these tools are not.

Not Professional Navigation, Stability, Safety, or Certification Advice

Content and tools on WorkHarbor, including the Knots Speed Converter, Nautical Distance & ETA Calculator, Cargo TEU Calculator, Ship Tonnage Calculator, Watch Schedule Planner, and Sea Time Calculator, are for educational and informational purposes only and are not a substitute for approved passage planning, official tonnage measurement, an approved stability and loading assessment, safe-manning and hours-of-rest requirements, or a maritime administration’s ruling on sea-service. They do not constitute professional navigational, engineering, safety, legal, or certification advice of any kind. The figures our tools provide are order-of-magnitude estimates, not guarantees. Always confirm with the ship and the relevant authority before you rely on a result.

Tool Accuracy and Limitations

Calculation Accuracy

Our calculators provide estimates based on standard maritime conventions, the figures you enter, and widely-accepted formulas — the great-circle (haversine) distance, the twenty-foot-equivalent-unit convention, the Moorsom tonnage relationship, and block-coefficient displacement, among others. Results are simplified teaching models: they omit refinements a real calculation applies, such as rhumb-line versus great-circle routeing, the full IMO Tonnage Convention deductions, and a vessel’s approved hydrostatics. Use them as starting points and learning aids, not as approved figures.

Factors Affecting Accuracy

Actual results may vary significantly due to:

• Weather & Sea State: Wind, current, tide, swell, and the resulting leeway and speed loss, and how they change the speed you actually make good.
• Vessel & Loading:Hull form, actual displacement, trim and draft, and the difference between a nominal block coefficient and a ship’s real hydrostatics.
• Routeing & Traffic: Traffic-separation schemes, canal and port transits, pilotage, and weather routeing that lengthen a passage beyond the straight-line distance.
• Measurement Factors: Self-reported figures, rounding, and the difference between an estimated and a surveyed or certificated value.

Our Recommendations

For dependable results at sea and ashore:

• Use tool results as starting points and learning aids, not approved values.
• Always consider the specific vessel, voyage, cargo, and conditions.
• Check any decision that affects safety with the ship’s officers before you act.
• Consult official publications, certificates, and your administration for specific questions.
• Compare multiple sources to improve future decisions.

Not Professional Advice

WorkHarbor tools and content do not constitute:

• Navigational or Passage-Planning Advice: Distance and ETA figures are general only and are not an approved passage plan; the appraisal, planning, execution, and monitoring of a passage rest with the ship.
• Stability or Loading Guidance:Tonnage and displacement estimates never replace a ship’s approved stability book, loading computer, or a surveyor’s measurement.
• Certification Rulings: Sea-time totals are a personal tally only and are not a determination of qualifying service by any maritime administration.
• Guaranteed Outcomes: Calculator outputs are planning aids only and are not a guarantee of time, tonnage, capacity, or eligibility.

Consider consulting official sources for:

• Passage planning, routeing, and under-keel and air-draft clearances
• Tonnage measurement, load lines, and approved stability and loading
• Safe manning, watchkeeping, and hours-of-rest requirements
• Qualifying sea-service, certificates of competency, and revalidation
• Cargo securing, dangerous goods, and terminal procedures

Safety Disclaimer

Our tools provide general guidance only. Decisions that affect the safety of a ship, her crew, or the marine environment can have lasting consequences and must rest with qualified personnel on board. Always:

• Defer to the Ship:Follow the master’s standing orders, company SMS procedures, and the officer of the watch for any operational decision.
• Respect the Rules: Treat the COLREGs, SOLAS, MARPOL, the STCW Convention, and flag- and port-state requirements as the authority; do not assume.
• Use Good Judgment:Cross-check every estimate against the ship’s own instruments, charts, and certificates.
• Confirm Before You Act: Validate any safety-critical figure with the responsible officer before relying on it.

No Warranty

WorkHarbor expressly disclaims all warranties, whether express, implied, statutory, or otherwise, including but not limited to implied warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that our tools, calculations, or information are error-free, accurate, or complete, or that our website will be available without interruption at all times.

Limitation of Liability

To the maximum extent permitted by applicable law, in no event shall WorkHarbor be liable for any direct, indirect, punitive, incidental, special, consequential, or exemplary damages, including without limitation damages for delay, off-hire, cargo claims, missed certification, goodwill, use, or data arising out of or related to your use of our tools and services.

User Responsibility

By using WorkHarbor tools and services, you acknowledge and agree that:

• You will use your own professional judgment, and consult a qualified officer or authority, when applying our tools to a real vessel, voyage, or certificate.
• You will verify calculation results against official sources before making important decisions.
• You are responsible for seeking authoritative guidance for any navigational, stability, safety, or certification matter that may apply to you.
• You assume all risks associated with maritime operations and the use of our tools and information.

External Links Disclaimer

The site may contain links to other websites or content originating from third parties. Such external links are not investigated, monitored, or checked for accuracy, adequacy, validity, reliability, availability, or completeness by us. We do not warrant, endorse, guarantee, or assume responsibility for the accuracy or reliability of any information offered by third-party websites linked through the site.

Advertising Disclaimer

WorkHarbor displays advertisements from third-party advertising networks, including Google AdSense. These advertisements are clearly distinguishable from our editorial content. The presence of advertisements on our website does not constitute an endorsement of the advertised products or services.

Changes to This Disclaimer

We reserve the right to modify this disclaimer at any time. Changes will be posted on this page with an updated revision date. Your continued use of our website and tools after any changes indicates your acceptance of the modified disclaimer.

Contact Us

If you have any questions or concerns about this Disclaimer, please visit our Contact page or email us at support@workharbor.com.