Setup
Pick a common port (optional)
Ship time
- Set Home and Destination.
- Hit Start journey when you leave.
- Use Reset if you're starting over.
How it works
- UTC is always shown and is the safest reference offshore.
- Home and Dest are timezone displays only (no GPS needed).
- Elapsed is stable while this page is open; after reload it falls back to device time.
- Your settings are saved locally on the device (Export/Import available).
- Offline: ads may not load; clocks still run.
Clocks
PWA = installable offline-capable app. Once installed, this tool can run offline after first load (ads may not).
Passage
What this tool does
Shows UTC, your fixed Home port, your Destination port, and a running passage timer on a single offline-ready dashboard. It's designed for boats that need to keep multiple reference clocks straight without digging through chartplotter menus.
You can also enable "ship's time" - a manual offset clock crews often slide during long passages.
How it works
- Set Home and Destination via the timezone fields or pick from common port presets.
- Tap Start journey to log the UTC departure time; the elapsed counter runs until you reset it.
- Optional: enable Ship time and set an offset from UTC to track the onboard schedule.
- Use the quick +/-30 buttons when the skipper bumps ship's time.
- All data saves locally in your browser, so reloading the page restores clocks and timers even without connectivity.
Common use cases
- Bluewater passages where crews juggle UTC logs and local landfall time.
- Rally fleets needing a quick glance dashboard during net check-ins.
- Delivery skippers reporting ETA back to owners.
- Race committees monitoring offshore fleets from shore.
- Families following along at home using the same Home/Destination view.
- Sail-training programs teaching how to manage ship's time.
FAQ
Does this work offline?
Yes. Once loaded, the PWA cache keeps everything available without a connection so long passages stay covered.
How accurate is the elapsed timer?
It uses your device clock. Large manual time changes can skew it, so avoid changing system time mid-passage.
Can I pre-load destination presets?
The preset dropdown ships with popular bluewater ports. Future releases will add more; for now you can type any timezone manually.
What if my device reboots?
The journey data is saved locally, so reopening the tool resumes from where you left off.
Why do I see "-" on the clocks?
Until you choose Home and Destination, the app leaves placeholders. Fill both fields to unlock the full display.
Is there an alarm?
Not yet. Passage Clock focuses on reference clocks and elapsed time; pair it with Interval Timer for alarms.