1600 Ton Mate Near Coastal Terrestrial Nav Problems?

Ok guys, I’m sure this has been beaten to death, but…

Does anyone know exactly what TYPES of questions COULD BE on the terrestrial portion of an ORIGINAL 1600 TON MATE NEAR COASTAL exam?

I’ve checked “Table 11.910-2—Endorsement Codes” from 46 CFR,


but, some testing material seems to have more than is given here.

Does anyone, by experience and/or knowledge, know exactly what is on there, and what I should be focusing my studies on??

Thank you for your time!

Time Tick, Gyro Compass error by azimuth or amplitude of the sun, Slip or required RPM, Swing Ship, Tides/Current, Sun Rise or Set, ETA - You should know how to work all the problems!

Learn how to do every question. I failed T-nav twice and the third time the questions i kept getting wrong weren’t even on the exam. Just learn it all to cya.

Fuel consumption ones were a pain for me when studying, had to do a hundred of the things to figure them out.

Search “nav problem test question” by ab murph.

Second page by msccapt posted that answer. I dont know how to cut and paste links on my phone or I would hyperlink it for you.

Thanks a lot guys, that was exactly the information that I needed!

Also preparing for 1600 ton mate NC and was curious about this. The CFR says compass error by azimuth/amplitude of the sun is only for Oceans, but several people I know who have taken the 1600 ton mate NC exam said they had a question on it. Is it the general consensus that the CFR just isn’t being followed to the letter?

It’s on the near coastal test because it’s a compass correction rather than a celestial question - or at least that’s how I understand it. I had them on both tests when I took my 3M and CM.

That is the understanding I had that many classmates argued against. I had them on the masters exam as well.

Righto, it makes total sense for a near coastal mate to need to know how to do an azimuth of the sun for compass correction. I’ve always assumed I’ll need to do it. I was just super confused when I looked at 46 CFR 10.910 and it said that I didn’t!

[QUOTE=New3M;129513]It’s on the near coastal test because it’s a compass correction rather than a celestial question - or at least that’s how I understand it. I had them on both tests when I took my 3M and CM.[/QUOTE]

It was added to N/C in 2001, for this reason. Near coastal licenses are good out to 200 miles, well beyond the range where compass error can be determined by visual observation of terrestrial objects.

So, we can safely assume that we will not have to worry about “The Sailings” on this particular test?

Mercator and mid lats?


Just passed nav problems 2 weeks ago for 1600 NC:

  • I was told to study amplitudes, because azimuth problems weren’t going to be given- whoever said that was wrong. I had an azimuth problem. study azimuths and amplitudes and you should be fine. If you don’t study, you can still figure it out from bowditch II

  • I had a tide problem as well. nothing too crazy- here’s the draft, and here is the depth of water under keel that I would like… at what time can I go through?

  • I got a speed of advance problem, which was no problem because I had the equation memorized beforehand [(pitchx rpmx 60min x %efficiency)/(6080 ft/nmi)]

  • I also had a GNARLY current problem about rotary tides. I was able to work this one out by checking appendices of the current book (rotary currents observed at Frying Pan Shoals?!?) Once I got the hang of it, it was a simple vector addition problem.

  • memorize the following equations (because they are not available in the exam room) slip, efficiency, % slip, distance run, speed of advance, fuel consumption 1 and fuel consumption 2. These are all listed in the front section of the nav problem murphy book.

  • know your D street (d = st)

  • CDMTV GE G add east, subtract west

  • I was expecting a time tick/ amplitude/ abomination problem, but I didnt get one

  • luminous and geographic range. luminous = nominal range and existing conditions; geographic range d= 1.17 x [square root height of eye] + 1.17 x [square root height of object

-aaaand know the amplitude of celestial horizon vs amplitude of visible horizon equations. (sin -1) (sin dec / cos Lat) = celestial horizon
(sin -1) ({sin dec - [sin Lat x sin h]} / cos Lat x cos h) = visible horizon. (you get h from table 23 bowditch)

I think that should be good. Highly recommend the murphy book on nav problems to see what you’re up against

Good luck

Awesome post man thanks !

I was reviewing this thread this morning before taking my final test, which was Nav Problems NC for 1600 mate. Thought I should give a trip report for some future young sailor. Sorry, I can only remember 8 of the questions off the top of my head! If I recall the others, I’ll edit this post for posterity. I took all 6 modules this week at REC Oakland, which was really a pretty pleasant experience. Everyone there was incredibly helpful and thoughtful.

  • question asking for best time for clearance of 2 feet over a rock that you’ll be over in 1h40m. Daylight savings time to boot.
  • period <0.3 knots around first afternoon slack. DST again. Table 4.
  • compass correction by amplitude on visible horizon
  • engine slip
  • CMG accounting for set and drift. I was scored wrong on this one, but am 100% sure I got it right. I was in a hurry so I didn’t fill out a comment card. Wish I had.
  • distance off abeam a light using Table 7 - not a special case
  • compass correction asking for deviation at a particular heading pgc. Required doing two separate CDMVTEG jobs and a simple interpolation. Easy enough, but hadn’t seen this particular question stem before. Kind of a fun problem to do, actually.
  • CTS accounting for leeway

Overall, really on the easier end, considering some of the wackier questions that are in the pool according to Murphy books and LAPware–both of which I worked through over and over for the past 6 months.

Additionally, I found a wrong answer on my chart plot portion (Long Island Sound). The question asked for depth of water given an exact lat/long. Super easy, and my fix was square over a 108’ sounding on the chart, and 108 was an answer choice. I read and re-read that question several times, and it was not asking for DBK. I’ve been nav officer on my (government) ship for years, am very confident with my plotting skills, and took the fix 3 times. I’m dead certain I’m correct. Even with getting that one wrong, I didn’t fail, so I didn’t challenge it officially. I did show it to the examiner, who said she would follow up with NMC.

I passed all 6 modules for 1600 ton NC two weeks ago in long beach and the nav test you described sounds exactly like the one i had. I actually got the rotary current problem wrong. I wasnt prepared for that type of problem and tried to follow the instructions in the tidal current book but fell short i guess. Luckily it was the only one i had wrong.

I had like 2-3 manuevering board problems, speed of advance, the minimum under keel clearance problem at a certain time, amplitude visible horizon, swing ship, compass correction with visible range, and i don’t remember the rest. It was definetly the hardest module and most frustrating. I studied for 3 months and spent majority of my time on terrestrial nav. Its a lot of information to learn for a 10 question test.

My advice for the fuel consumption and slip, speed of advance questions is to write down the formulas daily until you have them memorized. I think they total 8. Once you enter the testing room just write them all down on scratch paper. At least then you can relax and work your way through the questions.

Remember in bowditch page 505 for azimuth formula and page 370 for time zones.

The flux capacitor, which consists of a rectangular-shaped compartment with three flashing Geissler-style tubes (arranged in a “Y” configuration), is described by Doc as “what makes time travel possible.” The device is the core component of the time machine. True or False. This one always got me.

[QUOTE=nochtli;150098] I didn’t challenge it officially. I did show it to the examiner, who said she would follow up with NMC.[/QUOTE]

You can, and perhaps should have submitted a challenge form while you were at the REC. You can still do that even if you pass the exam. If you pass, it’s considered a comment and is still considered. It doesn’t get immediate priority consideration as your pass/fail decision is nbot hanging in the balance, but it still goes to NMC and gets considered. It’s better to submit the comment in your own words rathert than relying on the REC evaluator to accurately describe the perceived problem (ever play “telephone”?). You can also send comments after you leave the REC to IAskNMC@uscg.mil, be sure to note in your e-mail that it is for attention of the NMC exam team. You can also get the comment form hereand send that to IAskNMC@uscg.mil

That is perfectly valid, but the CFR’s are incorrect, or at the very least extremely misleading. It takes months of preparation to pass this exam, and being surprised with questions like those on test day is disastrous. Two and a half months to learn all of that material in time to retest is rough