28/28 · 14/14 · 21/21 · 75/75
Your crew is ashore five days this quarter. Here they are.
Mariners work rotations that never line up. MarinerSync lays every crewmate's hitch on one timeline and finds the windows you all have ashore — before the group chat loses them.
Sixteen weeks, four rotations
The problem
Nobody can hold four rotations in their head
A 28-and-28 and a 75-and-75 drift past each other for months. Working out when two of you are home takes a calendar and a pen. Working out when six of you are home takes a group chat, four screenshots, and a schedule that is already out of date by the time everyone answers.
So the reunion never gets planned. Not because the days aren't there — because nobody could find them.
How it works
Three steps, then it keeps itself current
Build the crew
Start a crew for the people you actually want to see — the old ship, the alumni, the fishing group — and share one invite link into the chat you already use.
Everyone enters a rotation
One anchor date and a cadence: 28 on, 28 off. That's the whole setup. Crew changes, extensions and early reliefs go in as exceptions on the day they happen.
The overlap shows itself
Every rotation is projected onto one timeline. The days the whole crew is ashore are marked, months out, and they update the moment anyone's schedule moves.
What's inside
Built for a working rotation
Everyone ashore
The headline view: the exact dates every crewmate is off hitch at the same time, projected a year out.
Same-vessel alerts
Enter the boat you're joining and MarinerSync tells you which crewmates will be sailing on it with you.
Crew chat
Each crew is a group chat with the schedule attached, plus one-to-one messages. The plan lives next to the dates it depends on.
Your year at a glance
A twelve-month grid of your own hitches, with tap-to-adjust exceptions and a shareable image export.
Crew map, if you want it
Share your position with one crew and see who else is nearby ashore. Off by default, per crew, and revocable.
No feed, no ads
No advertising, no tracking, nothing sold. You are here to find a week ashore, not to be an audience.
Find your next week ashore
Create an account, add your rotation, and send one link to the crew.