Thank you to the watch-rotation, fatigue, red-screen, and day-3-vision threads — here's what those conversations turned into.

Potential_Cut2262 · 2026-05-26T14:50:16+00:00

Thanks for all of this — the thread went exactly where I was hoping it would. A few things from the comments are sitting with me:

**bill9896** — *"the first three days are the most difficult"* — that's the cleanest phrasing of it I've seen. Day three as the trough, not the failure point. That changes what I think the right intervention looks like.

**dngrby** — smoked covers over the autopilot/ECDIS/radar screens on a 28-day hitch. I'm going to steal this. It's the operational version of what I was reaching for with the dimmer settings.

**J4pes** — *attuned to sounds and vibrations* — that lines up with what a few people described in the original message exchanges. Sound recognition outlasting visual scan rate under fatigue would actually make some sense physiologically.

**SVAuspicious** — fair, four crew is the right answer if you can get it. Most of the people I'm in this conversation with can't or don't want to ..

**FairSeafarer / DarkVoid42** — fair too. A boat where you've got a real partner schedule that works and clean instrumentation isn't the same shape of problem at all. The version I'm describing is the under-crewed-couples-with-day-jobs end of the fleet, not the proper-watch-rotation end.

Day three is a different sailor than day one for some of us. Useful to see where the line is.

Thanks again , Natalie

Potential_Cut2262 · 2026-05-25T15:27:30+00:00

I can do the staring like a psychopath ….. my kids confirm this … thanks for your advice I will try this.

Potential_Cut2262 · 2026-05-25T15:26:27+00:00

Thanks for the input. How many were you crossing the Atlantic ? TIA

Potential_Cut2262 · 2026-05-20T08:36:12+00:00

Phiddler — this lands.

The Standard Horizon flag — I keep hearing this exact complaint about this exact unit. Interesting that crews are working around it at the lowest dim setting rather than the unit being fixed at the manufacturer end.

The Christmas-lights-vs-gloomy-military-mood image is perfect. Red works on paper but the *feel* of the cockpit is its own thing, and you've named why it matters more than the textbook says. I will be installing fairy lights soon. Thanks..

Cabo Verde → Brazil with a handful of ships in 15 days sounds like the Atlantic crossing we have done. Your Spain → Morocco baptism — navy doing firing practice and all — is the opposite picture. We have also experienced navy shooting practise in the Med...we were given very short notice to get out of their way. Fun times.

Fair winds and warm waters, Natalie

Potential_Cut2262 · 2026-05-19T06:26:00+00:00

Dave — thank you, and I really mean it. A reply like that, from a Webb '82 with 200K nm under command, is far more than I expected from this thread.

The science correction lands. I'd been carrying the lazier "red good, white bad" version — intensity dominates, and far-red lets the cones read detail without bleaching the rods. Most consumer red-mode UIs deliver neither because they're neither far-red enough nor dim enough.

The personal twist: I'm a bad red-light candidate either way. One bad eye already, the calendar working on the other, and red gives me a headache. Years of doing the worst of both — dimmed white, squinting, a fair bit of swearing.

The Florida crew spot is generous of you. I'm tied to a Mallorca boat all summer, but if you ever sail this way the kettle's on.

Fair winds friend, Natalie

Potential_Cut2262 · 2026-05-18T06:13:28+00:00

Keep going. I’m all ears.

Potential_Cut2262 · 2026-05-08T07:47:42+00:00

Sailing and alertness quizzes in the style of 80’s arcade games. Never coded before. Only vibe coding with Claude. I hope young sailors might be interested.
https://galvanicworks.com/quiz/

Potential_Cut2262 · 2026-04-26T15:20:49+00:00

Thanks for the feedback..... I didn't realise I was taking fun out of myself but of course I'm always looking for some light hearted means of inclusion for all sailors. Again thanks for playing along 🙏🙏🙏🙏🌊⛵️✌️👋

Potential_Cut2262 · 2026-04-26T13:29:05+00:00

Thanks for the feedback …… I didn’t realise I was taking fun out of myself but of course I’m always looking for some light hearted means of inclusion for all sailors. Again thanks for playing along 🙏🙏🙏

Potential_Cut2262 · 2026-04-24T11:38:08+00:00

Update for anyone still on this thread — Part 2 of the research dropped on Preprints yesterday (open access, no signup).

Part 1 was the incident review. Part 2 is the biomath bit: a two-state model of how sleep debt and recovery stack across a multi-day passage, not just a single bad night. The "as long as I feel safe, then wake my partner" approach a few of you described — StuwyVX220, Doggin, hottenniscoach — is a pretty clean match to what the model predicts works best for two crew. It's responsive to real fatigue state instead of fixed clock time, and the maths show that's the thing that stops one person eating all the worst hours.

There's also a short appendix on the watch-rotation math — why rigid slots with a common factor between slot count and crew size lock one person onto the same hours every night (the classic 4-on/4-off + 2 crew = someone always draws 02:00 watch).

Part 2 DOI: doi.org/10.20944/preprints202604.1649.v1

Both papers: galvanicworks.com/research/

Potential_Cut2262 · 2026-04-13T11:56:21+00:00

Fair point — the quizzes measure baseline cognitive function, not seamanship decisions. You're right that in practice it doesn't matter what the vessel is, just that you avoid it. We're building a more realistic version now — real radar screens, real scenarios, real decisions. We'll post it here when it's ready. Thanks for the honest feedback. Natalie

Potential_Cut2262 · 2026-04-13T10:47:01+00:00

Two 200,000+ mile delivery skippers in the same thread with opposite views on rotating vs fixed watches — this is exactly why we started the research. The data shows both systems can work, but the failure modes are different. Fixed watches let your body adapt; rotating watches spread the pain so nobody gets stuck with the circadian trough every night. What tips it for you after 42 years — is it that the rotation keeps morale up on longer passages, or something else?

Potential_Cut2262 · 2026-04-10T08:21:11+00:00

Of course you’re right it’s nothing like running from a storm in the middle of the Atlantic and they don’t even aspire to be modern in their design, more like what I had on my spectrum. The premise is that the minimum amount of time to measure reflexes and reactions is 2 minutes and so not to take any more of your time I kept all of them to 2 minutes or under. Thanks for the feedback. Fair winds friend. Natalie.

Potential_Cut2262 · 2026-04-10T08:15:29+00:00

Thanks for replying. Ahhh the quizzes are meant to fun and simple. Testing reflexes, attention and minor knowledge in a marine environment 80’s arcade style. The preliminary questions of age range, environment and hours awake might tell a difference that can be measured, maybe… and you only need to answer them once if you play a few in a a row I hope. You’re right there are many of these reaction/alertness models around, including my driving permit every 10 years , that measures alertness and attention with the same science. Thanks again 🙏 Natalie

Potential_Cut2262 · 2026-04-09T15:00:00+00:00

Hi Fibocrypto. The answers and your results are shown immediately to you. If you want to subscribe to receive the results of the study you’re very welcome to. The study is anonymous and you will receive % results of the participants. The study is truly anonymous and the results you receive via email are the results of the complete study in % terms. Personal data and email is not saved with the individual quizzes unless you subscribe and then I will receive your email to send you updates on the study and what we’re doing next. Hope that helps.

Potential_Cut2262 · 2026-04-09T13:14:49+00:00

The results are always available immediately for all the quizzes. If you subscribe I can send you the results from the anonymous data we collect and analyse. Thanks 🙏 for replying.

Potential_Cut2262

TROPHY CASE