NMEA Advanced MEI (AMEI) Exam Study Guide (2026)
Everything the Advanced Marine Electronics Installer (AMEI) tests, topic by topic: what each section covers, the facts that come up most, and how to study it. Pair it with the free 15-question practice test.
The exam at a glance
| Questions | 50 multiple-choice questions |
|---|---|
| Time | Taken at the end of the training day. NMEA does not publish a time limit for the initial exam; the renewal test is 50 questions with a 1-hour limit |
| Passing score | 80% or higher. One proctored retake within 90 days; after that, re-attend the class at a 50% discount |
| Format | Open book, multiple choice, in person only. Course materials include printed slides and an electronic copy of the NMEA 0400 Installation Standard. The credential is issued only once you also have one year of verified field experience |
| Certifying body | National Marine Electronics Association (NMEA) |
| Test provider | NMEA instructors, in person only, at the end of a one-day class (see NMEA's training schedule); the exam is not sold on its own |
Mind map: the whole exam on one screen
Read the complete NMEA Advanced MEI (AMEI) study notes for “Radar Installations”
Our first full set of comprehensive notes, about 13 minutes of reading: Choosing the location · Antenna and beam · Power and cabling · Commissioning, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.
1. Radar Installations
Mounting, cabling and commissioning radar on larger vessels. NMEA does not publish topic weights for the AMEI exam; the class topics follow the NMEA 0400 Installation Standard.
Key facts
- Mount the scanner as high as practical for range, but above head height and clear of where people stand, because of RF exposure in the beam.
- Masts, stacks and other structures in the beam create blind (shadow) sectors; plan the mount to keep them small and record any that remain.
- A longer antenna gives a narrower horizontal beamwidth and better bearing discrimination.
- Commission by checking the bearing (heading line) alignment against a known target dead ahead, and set range and trigger delay per the maker's procedure.
- Chart overlay and MARPA need a stable heading at a fast update rate from a rate-compensated sensor or satellite compass.
- Use the maker's interconnect cable and check supply voltage drop at the scanner under transmit load; radar pedestals draw high start current.
- Mount on a rigid platform and level it for the boat's running trim, not its trim at the dock.
Flashcards
Exam tip: For radar, think in commissioning order: location and safety, cabling and power, then alignment and heading input.
2. Autopilot and Heading Sensor Installations
Drive units, rudder feedback, heading sensors and the dockside and sea-trial setup that makes an autopilot steer well.
Key facts
- Match the drive to the steering system: hydraulic pump sized to the cylinder volume, linear or rotary drives sized to the boat's displacement and rudder load.
- Rudder feedback linkage: parallel arms of equal length with the rudder centered, so the measured angle follows the rudder linearly.
- Dockside setup checks rudder direction, center and hard-over limits before going to sea.
- Mount magnetic heading sensors low, near the center of motion, and away from ferrous metal, speakers and high-current DC cables.
- Compass calibration (linearization) is done underway by turning slow circles in calm water.
- Snaking around the course means too much rudder gain; slow, lazy course correction means too little.
- Satellite compasses give true heading unaffected by magnetism, plus rate of turn, but need a clear view of the sky.
Flashcards
Exam tip: Sort autopilot questions into hardware (drive, feedback, sensor placement) and tuning (gain, calibration). The fix always matches the category of the symptom.
3. NMEA 0183 Installations
Wiring and configuring NMEA 0183 talkers and listeners, sentence structure and combining data with multiplexers.
Key facts
- NMEA 0183 uses RS-422 differential signaling: wire talker A (+) to listener A (+) and B (−) to B (−).
- Standard speed is 4800 baud; high-speed 0183 (38,400 baud) carries AIS and fast heading data. Both ends must match.
- One talker can feed several listeners, but each listener input takes only one talker; combine talkers with a multiplexer.
- A sentence starts with $ (or ! for encapsulated AIS data), then a two-letter talker ID and three-letter sentence type, comma-separated fields, * and a checksum.
- Maximum sentence length is 82 characters including the start character and the ending carriage return and line feed.
- For single-ended (RS-232 style) devices, connect the signal ground correctly and follow the maker's wiring for the unused line.
- Common sentences: RMC and GGA (position), HDG and HDT (heading), VTG (course and speed), DBT and DPT (depth), VDM (AIS).
Flashcards
Exam tip: Most 0183 faults are wiring polarity, baud mismatch or two talkers on one input. Check those three in that order.
Test yourself on these topics
Take the free 15-question NMEA Advanced MEI (AMEI) test, then save your results to unlock your Readiness Score and the mistakes bank.
4. DSC and AIS Installations
Installing and programming DSC VHF radios and AIS transponders, including MMSI rules, position inputs and antennas.
Key facts
- A DSC radio needs a programmed MMSI and a position input (NMEA 0183 or 2000) so distress alerts carry the vessel's position.
- DSC uses VHF channel 70; it must not be used for voice.
Flashcards
Exam tip: DSC and AIS questions often hinge on the MMSI and on position input. Ask yourself where each unit gets its identity and its position.
5. Data, Ethernet and Marine Computer Installations
Marine Ethernet networks, IP addressing, cabling, and power and mounting for marine computers.
Key facts
- Ethernet copper segments are limited to 100 m; use Cat5e or better, with consistent T568A or T568B termination at both ends of a straight-through cable.
- Most brands' marine Ethernet uses proprietary connectors and protocols; mixing brands needs gateways or NMEA OneNet-certified products.
Flashcards
Exam tip: For network faults, separate the layers: cable (tester), link (switch lights), then addressing (IP conflicts, DHCP).
6. Satellite Communications and TVRO Installations
Mounting and cabling satellite TV and communications antennas so they keep a clear view of the sky and stay out of the radar beam.
Key facts
- A satellite antenna needs a clear line of sight to the satellite on all headings it will be used on; masts and structures cause blockage on some headings.
- Keep domes out of the radar's vertical beam, above or below the scanner's plane, to protect the LNB and electronics.
Flashcards
Exam tip: Satcom questions almost always come down to line of sight or radar interference. Picture the dome's view of the sky.
7. Cybersecurity for Vessel Networks
Protecting the vessel's networks and navigation electronics from unauthorized access and bad software.
Key facts
- Change all default usernames and passwords on routers, modems, cameras and MFD web interfaces at installation.
- Separate guest and internet traffic from navigation and control systems with separate networks or VLANs.
Flashcards
Exam tip: Pick the answer that reduces exposure: fewer open doors, separated networks and trusted software.
How to pass
- Open book does not mean easy: with 80% to pass you can miss only 10 of 50, and NMEA reports about a quarter of candidates fail. Tab the NMEA 0400 sections for radar, autopilot, AIS and 0183 so you can find a figure in seconds.
- Questions assume you have installed the equipment. If you have never set up an autopilot rudder feedback unit or a Class A AIS, read the manufacturer's installation manual for one before the class.
- For NMEA 0183, know the wiring (A to A, B to B), baud rates (4800 standard, 38,400 high speed) and sentence structure, including the checksum.
- Commissioning is a theme across topics: radar bearing alignment, autopilot dockside setup and sea trial, AIS static data and DSC position input are all things you must check before handing the boat back.
Frequently asked questions
How long should I study for the NMEA Advanced MEI (AMEI) exam?
Most working candidates need 4 to 8 weeks at 45 to 60 minutes a day. Book your exam once your Readiness Score has stayed at 80 or higher for about a week.
Can I take the NMEA Advanced MEI (AMEI) exam online?
Yes. ABYC certification exams are taken with a proctor: online through a remote proctoring service, or for some certifications at the end of an ABYC class. Format: open book, multiple choice, in person only. course materials include printed slides and an electronic copy of the nmea 0400 installation standard. the credential is issued only once you also have one year of verified field experience. Ask the ABYC Education Department which reference materials are allowed.
What score do I need to pass the NMEA Advanced MEI (AMEI) exam?
80% or higher. One proctored retake within 90 days; after that, re-attend the class at a 50% discount. The exam has 50 multiple-choice questions and a time limit of taken at the end of the training day. nmea does not publish a time limit for the initial exam; the renewal test is 50 questions with a 1-hour limit.
What are the most tested topics?
The outline covers radar installations, autopilot and heading sensor installations, nmea 0183 installations, dsc and ais installations, data, ethernet and marine computer installations, satellite communications and tvro installations, cybersecurity for vessel networks. Use the free practice test to see which ones you need most.
The premium NMEA Advanced MEI (AMEI) study path
Premium NMEA Advanced MEI (AMEI) prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.
Your step-by-step study path
- 1Radar Installations9 key notes, 115 flashcards, then 450 practice questions in 18 sets of 25Notes free with an account
- 2Autopilot and Heading Sensor Installations9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 3NMEA 0183 Installations9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 4DSC and AIS Installations9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 5Data, Ethernet and Marine Computer Installations8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 6Satellite Communications and TVRO Installations8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 7Cybersecurity for Vessel Networks8 key notes, 110 flashcards, then 425 practice questions in 17 sets of 25Premium
- Final step: 6 full mock exams50 questions each, timed like test day. Pass them, then book your exam.Premium
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- Spaced repetition + mistakes bank
- Readiness Score & detailed reports
- Video lessons as they release
- Content updates during your access
- 5 bonuses: numbers and formulas sheet, standards map, study planner and more
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Summarized from ABYC's official candidate information and the rules cited, checked November 2026. Confirm current requirements with National Marine Electronics Association (NMEA).