Fathom: Marine Exam Prep
Deck & Engine, explained
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Every one of the 4,658 questions explains itself: why the right answer is right, why yours was wrong, and the rule it comes from. Offline, one payment, no subscription.
Every question tells you why.
Not a list of answers. Answer a question and the app explains it: why the correct option is correct, why the one you picked was not, and which rule it comes from — SOLAS II-2/3, COLREG Rule 19, MARPOL Annex VI. Not on the difficult ones. On all 4,658.
It works with no connection at all. The whole ticket is on the phone before you leave the quay.
WHAT A LIST OF ANSWERS CANNOT DO
• An explanation on every one of the 4,658 questions, and on 4,652 of them a separate note on each wrong option — written for this app, not copied from anywhere.
• 1,217 answers cite the rule they come from, so you can go and read it.
• Sound signals you can hear. Nine questions ask what a signal means — the whistle, the bell, the gong. Everywhere else they are printed as a photograph of a horn and left unanswerable. Press play instead.
• Diagrams where the question is a picture — the lights, the symbols, the indicator cards — and search across the whole ticket.
WOULD I PASS TODAY
• An estimate of the score you would get sitting the paper now. It weights each topic by how much of the exam that topic usually takes, so it answers the question you actually have.
• The paper itself, timed: 60 minutes, 70 questions, no feedback until you hand it in — the sitting as it is sat. Marked against the pass mark your company asks for, and broken down by topic afterwards.
• A review schedule. What you get wrong comes back tomorrow; what you know comes back in three weeks.
• Statistics by topic, bookmarks, and a mistakes list that fills itself.
WHAT IS COVERED
Built for the CES (Crew Evaluation System) computer test: every rank it is sat for, named the way your crewing office names it — department, level, vessel. Up to 1,030 questions for one ticket, 4,658 across the catalogue.
Deck — Management, for master and chief officer. Operational, for the officer of the watch. Both across twenty vessel types: oil, chemical, LNG and LPG tankers, bulk, container, general cargo, RoRo and RoRo passenger, passenger, pure car carrier, reefer, platform supply, anchor handling, seismic survey and shuttle tankers, with or without dynamic positioning.
Engine — Management, for chief and second engineer. Operational, for the watch engineer. Slow speed, medium speed and steam plants.
ETO — for the electro-technical officer.
BEFORE YOU PAY
A fifth of every ticket is open, and the short paper — 25 questions, timed and marked like the real one — is free. You can read the questions, the explanations and sit a paper before deciding. If it is not what you need, you have lost nothing.
ONE PAYMENT
Each ticket is a single purchase. No subscription, no account, no sign-in, and nothing to renew while you are at sea for six months.
DESIGNED FOR A SHIP
Dark by default, because a white screen on a night watch costs you your night vision. Readable at any text size, and it works with VoiceOver. Nothing is sent anywhere: there is no server, no analytics, and no advertising.
This app is an independent study aid, written and published by one developer. It is not affiliated with, endorsed by, or connected to Seagull, Ocean Technologies Group or any other provider of crew evaluation tests, and it is not the test. CES is a trademark of its owner.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• The rule a question rests on now appears once you have answered it, not before. On the sound-signal questions it gave the answer away.
• After a paper, the questions to go back to are right under your score: what you got wrong and what you did not reach, with their explanations.
• The study map has a Continue button that takes you straight back to the block you left.
• The app now says plainly that it is a study aid for the CES test, and Settings has an About section saying what the app is and what it is not.
• A new colour for buttons and progress, so the green, amber and red of marking mean only that.
The developer, Danylo Budylkin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Danylo Budylkin
- Size
- 20.4 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Eng Ops · Steam $4.99
- ETO · Management $2.99
- Eng Ops · Generic $3.99
- Eng Ops · Slow Speed $4.99
- Eng Ops · Medium Speed $4.99
- Eng Mgmt · Steam $4.99
- Eng Mgmt · Slow Speed $4.99
- Eng Mgmt · Generic $3.99
- Eng Mgmt · Medium Speed $4.99
- Deck Ops · Shuttle Tanker $4.99
- Copyright
- © 2026 Daniel Budylkin