The sailing handbook on your phone that answers your questions at sea

SeaSafe is an offline app for skippers bringing a newly bought boat home themselves. Ask what you see and what to do. The answer comes in seconds from 12 sailing textbooks and the COLREGs stored on the phone, with no signal and with the source shown.

Works in airplane mode
Source under every answer
27 emergency cards
English, German, Russian

Free to install. The apps are in store review. Get one email when they go live.

03:10offline

Night watchOffline, model on this phone

Two white lights one above the other and a red light to the left of them. What is it?

A power-driven vessel over 50 m under way, showing you her port side. She is crossing from your left.

COLREGs, Rule 23Lights of power-driven vessels

AI answer, not expert-reviewed

We are motoring. She is on our right, crossing ahead. Who gives way?

Under engine you count as power-driven, so you give way. Alter to starboard early and pass behind her

Ask the handbook

✱ Emergency

Three things SeaSafe does for you on the passage

Tells you what you are looking at

Lights at night, buoys and marks, shapes and sound signals. Describe it in your words and get what it is and what it means for you.

"Yellow buoy with two black cones pointing up?"

Tells you what to do next

Who gives way, when to reef, how to cross a traffic separation scheme, what to check when the engine stops. With the rule it comes from.

"Ship on my right, crossing ahead. Who gives way?"

Walks you through an emergency

Person overboard, Mayday, fire, flooding and 23 more. One tap on the red bar, one step per screen, no typing and no model needed.

The Mayday card has the radio call written out.

All three serve one goal: get your boat to your home port under your own command, without a moment where nobody on board knows what to do.

Made for this situation

SeaSafe is built for one kind of trip. If three of these are true for you, it was made for you.

You bought a boat and she is in another countryOften Sweden or Denmark, and the berth fee is running.
You are bringing her home yourselfYou turned down a delivery skipper, because of the price or because you want to sail her yourself.
You have the licence, but not the milesDay Skipper, SKS, ICC or similar, and no night passages yet.
Nobody on board is more experienced than youThe crew are friends or family with the same background.
The passage takes more than a day without a stopSo there are night watches and long stretches without signal.
Your time window is fixedHoliday dates or the berth contract do not let you wait a week for better weather.

When to install it: as soon as the date to collect the boat is set. The handbook downloads over Wi-Fi at home; it cannot be done at sea.

What changes at sea, in numbers you can check

Compared with the textbook in the cabin, which is what most crews have when a question comes up.

What matters to you	Textbook in the cabin	SeaSafe
Time from question to answer	Minutes: find the book, the index, the page, by headtorch	Seconds: type the question in your own words
Signal needed	None	None. The model runs on the phone, airplane mode is normal
Can you check the answer	Yes, it is the source	Yes. Book and section under every answer, one tap to the original text
Emergency procedure	Somewhere in chapter 12	Under 1 second from any screen, works even if the model is not loaded
Languages	One	English, German, Russian, switch at any time
Cost	The book you own	Free for 3 questions a day. One payment for unlimited, no subscription

How it works

Two steps happen at home, before you leave. The third is at sea.

18:20Wi-Fi

Step 1 of 2

Loading the handbook

This phone has 8 GB of memory, so you get the larger model. One download, 2.6 GB, over Wi-Fi.

1.6 of 2.6 GB

Language modeldownloading
Handbook, 4,464 notesready
Emergency cardsready

You can close the app. The download resumes where it stopped.

Continue in background

1. Install at homeThe app checks your phone's memory and picks the model that fits: 2.6 GB on newer phones, 0.6 GB on older ones.

14:05offline

Day 2Offline, model on this phone

Wind went from 12 to 20 knots in half an hour. When do I put the first reef in?

Now. The rule in the handbook is: reef when you first think about it. At 20 knots true with a crew that has not reefed before, take the first reef and shake it out later if you were early.

Sail trim, chapter 7Reducing sail

AI answer, not expert-reviewed

2 of 3 free questions left todayUnlock

Ask the handbook

✱ Emergency

2. Ask at seaThe model searches 4,464 notes from 12 textbooks and the COLREGs, then answers only from what it found. Conversations stay on the phone.

23:48offline

Emergency cardWorks without the model

Person overboard

Mayday / distress

Fire on board

Leak or flooding

Steering failure

Engine failure

Grounding

Dismasting

Medical, unconscious

3. When there is no time to typeThe red bar is on every screen. Behind it, 27 cards: what to do first, what to say on the radio, what to do if it did not work.

What crews use today, and where it breaks

Each option works somewhere. None of them works at 03:00, forty miles out, when you have the question.

Option	What it costs	Where it breaks on a first passage
Delivery skipper	Often 20 to 50% of the price of an older boat	Expensive, and you are a passenger on your own boat
Experienced mentor on board	About €120 to €300 a day plus travel	Hard to find for your dates, and you still pay for every day
A friend on the phone	Free	Needs signal and a friend awake at night. Hard to ask twice
ChatGPT or a search engine	Free	Needs a network. Answers from general memory, not from a sailing textbook, with no source to check
The textbook	Already on board	Correct, but too slow to search on a moving deck in the dark
Windy, PredictWind	Free to about €50 a year	Gives weather data, not what to do with it

What people worry about before installing

"It will not work without internet"

It is built for that. The model and the handbook are files on your phone. After the first download you can switch on airplane mode and everything works. We test it that way.

"The AI will tell me something wrong"

It can. That is why every answer shows the book and section it came from and is marked "not expert-reviewed". Read the source when it matters. The skipper decides, not the phone.

"I will panic and will not be able to type"

For emergencies there is no chat. The red bar opens a card in under a second, one step per screen, large text. It works even if the model is not loaded.

"My phone will not run it"

The app checks memory before downloading anything. About 6 GB of RAM gets the larger model, about 4 GB the smaller one. Below that it tells you straight away.

"Another subscription"

There is none. Install free, 3 questions a day free, emergency cards always free. Unlimited questions are one payment through the App Store or Google Play.

"My questions go to some server"

They stay on your phone. No account, no analytics, no ads. The only network traffic is the model download and, if you buy, the store purchase. See the privacy policy.

What SeaSafe is not

Not a chartplotter or navigation aid: no chart, GPS track, AIS or routing.
Not a weather service: it does not tell you whether to leave port.
Not a distress device: in an emergency call on VHF channel 16 first. The card tells you what to say; it does not call anyone.
Not a replacement for training or official publications.

At the end of the passage

Lines ashore in your home port. The boat arrived without a new repair bill, and you brought her yourself. On the way you looked up the right-of-way rules a dozen times, and by the last night you stopped needing to. SeaSafe does not sail the boat. It makes sure that when a question comes, you have the answer and the page it came from.

Install SeaSafe before you leave the dock

First step: install it at home and load the handbook on Wi-Fi. It takes a few minutes and is free.

Free

€0install and keep

3 questions a day
All 27 emergency cards, always
The full handbook on the phone
Conversations saved on the device

Full access

One paymentprice shown in the store, no subscription

Unlimited questions, offline
All 27 emergency cards, always
On every phone with the same store account
Handbook updates included

Get one email when it is live. Nothing else.