200+ Free USCG Master 100 Practice Questions
Pass your USCG Master 100-Ton Captain License exam on the first try — instant access, no signup required.
Loading practice questions...
Key Facts: USCG Master 100 Exam
210
Questions on Original Path
USCG ONC06 sample exams
90%
Rules/Plot Passing Score
USCG sample exams
3.5 hrs
Max Time per Module
USCG sample exams
$95
Exam Fee
NMC fee schedule
$240
Typical Original Total Fee
Evaluation + exam + issuance
Jan 28, 2026
ASAP Portal Rollout
NMC ASAP notice
As of March 12, 2026, the Coast Guard's ONC06 sample-exam structure for Master Less Than 100 GRT Near Coastal/Inland still uses five modules totaling 210 questions: four 50-question modules plus a 10-question chart-plot module. Most modules require 70% to pass, but Rules of the Road and Chart Plot require 90%. I did not find a separate 2026 blueprint change to those module weights; the main recent applicant-facing changes are the January 19, 2025 Pay.gov fee-payment shift and the January 28, 2026 ASAP application-portal rollout.
About the USCG Master 100 Exam
The USCG Master 100-Ton Captain License exam is the knowledge-test path for Master Less Than 100 GRT credentials used for near coastal or inland passenger-vessel operations. The official sample-exam structure emphasizes Rules of the Road, deck seamanship and safety, navigation fundamentals, and chart-plotting competence.
Assessment
Original ONC06 path: Rules of the Road (50), Deck General (50), Deck Safety (50), Navigation General (50), and Chart Plot (10). Raise of grade from OUPV Near Coastal uses module Q165 (50 questions).
Time Limit
Up to 3.5 hours per module
Passing Score
70% most modules; 90% Rules of the Road and Chart Plot
Exam Fee
$95 exam fee; $240 total typical original application (U.S. Coast Guard National Maritime Center (NMC) / Regional Exam Centers)
USCG Master 100 Exam Content Outline
Rules of the Road
Lookout responsibilities, risk of collision, steering and sailing rules, lights and shapes, sound signals, narrow channels, and traffic separation schemes.
Deck General
Seamanship, line handling, anchoring, stability and tonnage basics, vessel documents, passenger operations, and watchkeeping responsibilities.
Deck Safety
Required safety equipment, firefighting, survival craft, emergency procedures, first aid, pollution prevention, heavy-weather decisions, and damage control.
Navigation General
Charts and publications, aids to navigation, compass error, bearings, tides and currents, piloting, dead reckoning, and marine weather interpretation.
Chart Plot
Course, speed, time, distance, set and drift, fixes, and chart-work reasoning using standard plotting methods.
How to Pass the USCG Master 100 Exam
What You Need to Know
- Passing score: 70% most modules; 90% Rules of the Road and Chart Plot
- Assessment: Original ONC06 path: Rules of the Road (50), Deck General (50), Deck Safety (50), Navigation General (50), and Chart Plot (10). Raise of grade from OUPV Near Coastal uses module Q165 (50 questions).
- Time limit: Up to 3.5 hours per module
- Exam fee: $95 exam fee; $240 total typical original application
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
USCG Master 100 Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the USCG Master 100-Ton exam?
For the original ONC06 path, the Coast Guard sample-exam guide shows 210 total questions: Rules of the Road (50), Deck General (50), Deck Safety (50), Navigation General (50), and Chart Plot (10). If you are raising grade from OUPV Near Coastal to Master Less Than 100 GRT Near Coastal, the guide lists a separate 50-question Q165 module instead.
What passing score do I need?
Most modules require 70% to pass. Rules of the Road and the Chart Plot module are stricter and require 90%, which means you need especially strong mastery of collision-avoidance rules and basic chart-work accuracy.
How long is the exam?
The current Coast Guard sample exams list a maximum time allowed of 3.5 hours per module. Because the original exam path is modular, your total testing time depends on which modules you take and whether you test them together or across separate sessions.
How much does the Master 100-Ton exam cost?
The current NMC fee schedule lists a $95 examination fee. For a typical original officer endorsement application, the current breakdown is $100 evaluation, $95 examination, and $45 issuance, for $240 total; raise-of-grade applications are lower on the evaluation portion.
What changed for 2026 applicants?
I did not find a separate 2026 change to the ONC06 exam-module structure itself. The main current process changes are that fee payments shifted to Pay.gov on January 19, 2025, and the new NMC ASAP portal launched on January 28, 2026 as the current online application route.
What calculator can I bring?
The NMC calculator policy page states that, effective January 1, 2024, the Texas Instruments TI-30XIIS is the accepted scientific calculator model for examinations that require one. Programmable, graphing, or memory-retaining devices are not acceptable for REC testing.
What topics matter most for scoring?
Rules of the Road is high stakes because it is both a full 50-question module and a 90% passing requirement. After that, the largest study blocks are Deck General, Deck Safety, and Navigation General, each carrying 50 questions in the official sample-exam structure.