Launched this week
NavChrono
Maritime ETA & Passage Calculator
2 followers
Maritime ETA & Passage Calculator
2 followers
Professional offline maritime ETA calculator, interactive multi-waypoint nautical chart plotter, port-to-port sea distance matrix, and IMO Resolution A.893(21) compliance verification tool for deck officers, ship masters, and commercial operators.
Meet NavChrono ā Navigation calculations without internet dependency.
Life at sea comes with a unique challenge: internet connectivity is often unavailable, unreliable or limited. Yet navigation officers, mariners and boaters still need to calculate distances, estimate arrival times and prepare passage plans quickly and accurately.
I built NavChrono to solve this problem.
NavChrono is an offline-first maritime ETA and passage-planning calculator designed specifically for people who work and travel on the water.
Whether you are planning a long ocean passage, calculating the ETA between two ports, checking time zone differences or preparing voyage information, NavChrono brings essential calculations together in one convenient tool.
The best part? It works 100% offline. No internet connection required.
What problem does NavChrono solve?
Navigation professionals often need to perform quick voyage calculations, sometimes under time pressure and in environments where internet access simply isn't available.
Relying on online tools is not always practical onboard. Switching between multiple websites, calculators and reference tools also takes unnecessary time.
NavChrono brings these essential functions together in one place, making passage planning faster, simpler and more convenient.
What can you do with NavChrono?
ETA Calculator: Calculate estimated time of arrival based on departure details, distance and vessel speed.
Passage Planning: Organise and calculate voyage passages.
Distance Table: Quickly reference distances between ports.
Saved Passages: Save and revisit previously calculated voyages.
Speed Matrix: Compare voyage times at different vessel speeds.
Time Zone Calculations: Account for time differences and operational date changes between departure and arrival locations.
UN/LOCODE: Work with internationally recognised port and location codes.
IMO Verification: Access useful vessel-related verification functionality.
Flexible Access: Use NavChrono on mobile, tablet and desktop.
Who is it for?
NavChrono is designed for:
Ship navigation officers and deck officers.
Merchant navy professionals and seafarers.
Commercial vessel operators.
Yacht owners and recreational boaters.
Maritime students and cadets.
Anyone who needs practical maritime voyage calculations.
Why I built it
I wanted to build something genuinely useful for the maritime community.
At sea, you cannot always depend on an internet connection. Essential navigation calculations should not become unavailable just because connectivity is lost.
I wanted to put useful maritime calculation and passage-planning tools into one accessible platform that works wherever you are.
NavChrono is available as a web application and across mobile platforms, so you can access it on the device that suits your workflow.
My goal is simple: make maritime calculations accessible, practical and reliable, whether you are connected to the internet or sailing thousands of miles offshore.
Fair winds and safe passages!
ā The NavChrono Team