The EOOW & ETO Bible

The complete study companion for marine engineers preparing for the MCA EOOW and ETO Certificates of Competence.

Built around the STCW A-III/1 and A-III/6 syllabus (MCA MIN 654) — from exam prep to engine-room watch.

The EOOW & ETO Bible covers every topic on the MCA Engineer Officer of the Watch (EOOW) and Electro-Technical Officer (ETO) syllabus in a single app. Sitting Part A and Part B? It's your exam companion. Already qualified and heading back to sea? It's the fastest way to sharpen up before stepping into the engine room.

CHOOSE YOUR PATH
Pick EOOW or ETO when you sign up and your syllabus adapts to you. Switch roles any time in Settings.

PART A EXAM SIMULATOR
Replicate the real Part A exam experience with all five question types: Multiple choice, True/False, Matching, Fill in the blank, and Drag and drop.

15 questions. 40 minutes. No returning to previous questions. Per-topic pass threshold tracking so you always know where you stand.

AI ORAL EXAM SIMULATOR
Practice your Part B oral with an AI examiner. Two modes:
• Session Mode — A full multi-turn oral examination on a scenario
• Quick Assessment — Submit a free-text answer for a structured grading report with verdict, score, and examiner commentary

SPACED REPETITION FLASHCARDS
Flashcards across all 12 modules powered by the SM-2 spaced repetition algorithm. The app learns what you know and surfaces the right cards at the right time.

12 COMPLETE MODULES
Marine Diesel Engines · Marine Boilers & Steam · Auxiliary Machinery · Marine Electrical Systems · Automation & Control · Refrigeration & Air Conditioning · Naval Architecture & Stability · Safety & Firefighting · Environmental Compliance (MARPOL) · Watchkeeping & ER Management · High Voltage Systems · Electronics, PLCs & Navigation Systems

All mapped to MCA MIN 654 and the STCW A-III/1 / A-III/6 syllabus.

QUICK REFERENCE LIBRARY
Instant-access reference topics — the rules and data you actually need, not buried in lesson content:
Refrigerant properties & classifications · MARPOL discharge limits · Fuel-oil treatment procedures · Electrical safety rules · SOLAS LSA & firefighting equipment requirements

Equally useful for exam candidates and for qualified engineers who want a fast refresher before returning to sea.

GAMIFICATION
XP, levels, streaks, and daily challenges to keep you consistent through exam prep. Progress through engineering ranks — Motorman to Chief Engineer.

WORKS OFFLINE
All content — flashcards, lessons, quick reference, and exam simulator — works completely offline. Whether studying at sea or on a long-haul flight.

START FREE
The Marine Electrical Systems and Marine Diesel Engines modules are completely free. Unlock all 12 modules, the full oral simulator and unlimited mock exams with Premium.

The EOOW & ETO Bible is an educational study tool and is not affiliated with, endorsed by or sponsored by the Maritime and Coastguard Agency (MCA) or any certifying body.