References for bridge work and everyday learning
Use CaptainCalc with approved vessel documents, official publications and company procedures. These links are starting points, not a substitute for controlled onboard references.
Practical CaptainCalc references
Beaufort wind scale & sea state
Practical wind-force and sea-state reference.
Open →IALA buoyage system
Visual summary of lateral, cardinal and special marks.
Open →COLREG lights and shapes
Quick visual identification for common vessel situations.
Open →Professional tides & UKC guide
How to interpret source, datum, confidence, tide, squat and safety margins.
Open →GMDSS operational guide
Preparation boundaries, readiness, radio logs and MSI/NAVTEX review.
Open →Stability and draft workflow
Understand the inputs, criteria, results and saved records.
Open →Where the information comes from
Before using a result, check its provider, datum, time basis, confidence and installed-data details.
Open →Check your inputs
Complete missing information and correct inconsistent or out-of-range vessel, position and calculation values.
Open →Understand the calculation
Keep the units, vessel particulars, time zone and selected method in view when reading a result or export.
Open →When to stop and review
Read each warning, correct its cause and recalculate before continuing.
Open →Use it within its limits
CaptainCalc supports decisions; approved vessel documents, official publications and the master's judgement remain authoritative.
Open →
Authoritative external sources
IMO
International maritime conventions, safety and GMDSS framework.
Open →IHO
Hydrographic standards and official hydrographic-office routing.
Open →IALA
Marine aids-to-navigation standards and guidance.
Open →NOAA Tides & Currents
Official United States water-level, current and station information.
Open →CaptainCalc is decision support. It never replaces approved stability data, loading computers, ECDIS, official publications, procedures or professional judgment.
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