PassagePro
The calculations and references a watchkeeper reaches for, in one place: plan a voyage waypoint by waypoint, reduce your sights and plot the fix, work out tides and under-keel clearance, and look up the Rules of the Road, IALA buoyage and ECDIS symbols. Its methods follow Bowditch, and it works offline once opened.
What it does
Free to use in your browser. No ads, no account and no purchases, and it works offline after your first visit.
Voyage Planning
Build a passage waypoint by waypoint on a Mercator chart, with rhumb line or great circle legs, ETAs in ship’s time, the waters and countries you cross, and noon reports.
Celestial Navigation
An almanac computed on your device for the Sun, Moon, planets and 57 navigational stars, with sight reduction and a plotted fix, latitude sights, a star finder, sunrise and twilight, and compass error.
Tides and Under-Keel Clearance
Enter the tide table’s high and low waters to get the height at any time, the under-keel clearance and the windows when your vessel can pass.
Rules, Buoyage and Symbols
COLREG rules, lights, shapes and sound signals with encounter and CPA tools, IALA buoyage in Regions A and B, and ECDIS symbols, each with practice questions.
Bowditch and Study Notes
Calculation tables and worked examples after Bowditch, plus notes in PassagePro’s own words on the Mariner’s Handbook, Ships’ Routeing and Ocean Passages, and links to the makers’ equipment manuals.
Gallery
Tap any picture to see it big. Arrow keys and swipes move between them.
How it works
Three steps and you’re in.
Choose a Module
Voyage, Celestial, Tides, Rules of the Road, IALA, ECDIS and more sit in the rail on a big screen, or along the top on a phone.
Enter Your Figures
Each tool shows a worked sample to start from. Change the figures and the results update at once.
Check Against Official Sources
PassagePro is a calculation and study aid. Cross-check with the Nautical Almanac, official tide tables, charts and your ECDIS.
PassagePro
Free to use. No account required. Works offline. A calculation and study aid, not for navigation. Always use official charts and publications. ADMIRALTY is a registered trade mark of the UK Hydrographic Office; PassagePro is independent and not affiliated with the UKHO or any equipment maker.
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