MMC Study Guide 2026
Everything you need to pass the MMC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 MMC Exam Format at a Glance
📚 MMC Topics to Study (31)
✍️ Sample MMC Questions & Answers
1. When a vessel receives a distress call, the OOW must FIRST:
The OOW must acknowledge the distress call and immediately inform the master, who will then decide on the appropriate course of action.
2. A vessel's DR position differs from an EP (Estimated Position) because the EP:
An Estimated Position (EP) is more accurate than a Dead Reckoning (DR) position because it incorporates known or estimated effects of current, wind, and leeway.
3. When using parallel rulers to transfer a course line to the compass rose, the transfer should always be made to the:
The outer ring of a chart's compass rose shows true directions referenced to geographic north, while the inner ring shows magnetic directions.
4. What is a common challenge professionals face when applying regulatory compliance & legal framework principles in Merchant Mariner Credential?
Balancing theoretical knowledge with practical application is a well-recognized challenge, as real-world scenarios often present complexities not covered in standard training.
5. What is the MINIMUM number of persons required to lower a survival craft on a USCG-inspected vessel?
Survival craft must be designed and tested so that a single person can lower them, ensuring they can be launched even if crew is reduced.
6. Free surface effect in a partially filled tank reduces a vessel's effective GM because:
When a vessel heels, liquid in a partially filled tank shifts to the low side, effectively raising G and reducing GM, degrading stability.