# Fathom: Marine Exam Prep — Deck & Engine, explained > Deck & Engine, explained (iPhone/iPad app by Danylo Budylkin.) - Source: https://appshunter.io/ios/app/fathom-marine-exam-prep/id6813876741 (this page in markdown: same URL + `.md`) - Developer: [Danylo Budylkin](https://appshunter.io/developer/6778012130) - Category: Education, Reference - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 17.0 · 19 MB - Languages: American English - Released: 2026-09-21 - Data updated: 2026-09-24 - User reviews in markdown: https://appshunter.io/ios/app/fathom-marine-exam-prep/id6813876741/reviews.md ## What is Fathom? 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 Every rank the computer exam 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 any operator of crew evaluation or assessment systems, and it is not the test. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Deck Ops · Shuttle Tanker | $4.99 | one-time | | Eng Mgmt · Medium Speed | $4.99 | one-time | | Eng Mgmt · Generic | $3.99 | one-time | | Eng Mgmt · Slow Speed | $4.99 | one-time | | Eng Mgmt · Steam | $4.99 | one-time | | Eng Ops · Medium Speed | $4.99 | one-time | | Eng Ops · Slow Speed | $4.99 | one-time | | Eng Ops · Generic | $3.99 | one-time | | ETO · Management | $2.99 | one-time | | Eng Ops · Steam | $4.99 | one-time | ## Version history (last 1 release) ### 1.0.1 — 2026-09-21 No release notes. ## More apps by Danylo Budylkin - [Binnacle: Nautical Calculator](https://appshunter.io/ios/app/binnacle-nautical-calculator/id6523426668) - [Deckmint AI Presentation Maker](https://appshunter.io/ios/app/deckmint-ai-presentation-maker/id6778012128) - [Unstuck: ADHD Focus & Tasks](https://appshunter.io/ios/app/unstuck-adhd-focus-and-tasks/id6779562324) - [Fastix: Fasting Timer & Diet](https://appshunter.io/ios/app/fastix-fasting-timer-and-diet/id6780178790) - [Portbook Sea Ports](https://appshunter.io/ios/app/portbook-sea-ports/id6797213460) All apps by Danylo Budylkin: https://appshunter.io/developer/6778012130 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-24.*