The full 232-question NBTC bank for the Restricted Operator's Certificate — sea area A1, VHF-DSC. Three subject areas, official answer keys, nothing rewritten. Free, no sign-up.
Work through all 232 questions. Stop anytime — your progress is saved.
50 random questions, 60 minutes. Just like the real exam.
The certificate is valid for sea area A1 — the band of coastal water within VHF range of a shore station with continuous DSC watch. Within it you work VHF and VHF-DSC. Everything beyond, meaning Inmarsat, MF/HF DSC and NBDP, sits outside this certificate and outside this question bank. Officers going further offshore sit the GOC instead.
A fair amount, but not as much as people assume: roughly 147 questions appear in both banks in some form, out of 232 here and 431 there. The shared ground is distress procedure, SART and EPIRB, and MSI. What the ROC bank does not touch at all is satellite and MF/HF work. Passing one is not evidence you would pass the other.
From ภาคผนวก ฉ: (1) general information, system overview and FCC rules; (2) DSC and alpha-numeric identity systems with distress, urgency and safety traffic; (3) survival craft equipment and SAR, Maritime Safety Information, and VHF-DSC equipment. Clause 19(1) requires at least 60% in each of them separately — the third area alone carries 107 of the 232 questions.
It is not. The 60%-per-subject pass mark is official; the question count and the clock are ours. Fifty matches one draw from NBTC's E-Practice system and sixty minutes is simply a sensible pace. We would rather flag this than let a practice convention look like a regulation.
No. The questions are NBTC's, published openly at oss.nbtc.go.th; the site you are on is independent and unaffiliated. Sit the examination through an NBTC-approved training station.
12 sample questions from a bank of 232.
1. What is the basic concept of GMDSS?
Source: NBTC E-Practice ROC หมวด 1 · etid 2281
2. GMDSS is primarily a system based on:
Source: NBTC E-Practice ROC หมวด 1 · etid 2282
3. What is the responsibility of compulsory GMDSS vessels?
Source: NBTC E-Practice ROC หมวด 1 · etid 2283
4. GMDSS is required for which of the following?
Source: NBTC E-Practice ROC หมวด 1 · etid 2284
5. What equipment is used in or near the survival craft?
Source: NBTC E-Practice ROC หมวด 1 · etid 2287
6. What equipment is programmed to initiate transmission of Distress alerts and calls to individual stations?
Source: NBTC E-Practice ROC หมวด 1 · etid 2288
7. If a vessel is on a voyage from Miami, Florida to Houston, Texas what Sea Areas may it transit through?
Source: NBTC E-Practice ROC หมวด 1 · etid 2292
8. For a vessel to be in GMDSS Sea Area A-1:
Source: NBTC E-Practice ROC หมวด 1 · etid 2294
9. What is defined as the area within the radiotelephone coverage area of at least one VHF coast station in which continuous DSC alerting is available as defined by the IMO regulation for GMDSS?
Source: NBTC E-Practice ROC หมวด 1 · etid 2296
10. Which GMDSS communication functions must all compulsory vessels be capable of performing to meet International Maritime Organization requirements?
Source: NBTC E-Practice ROC หมวด 1 · etid 2298
11. GMDSS-equipped ships will be required to perform which of the following communications functions?
Source: NBTC E-Practice ROC หมวด 1 · etid 2299
12. What equipment can be used to receive Maritime Safety Information?
Source: NBTC E-Practice ROC หมวด 1 · etid 2300
Questions and answer keys are the central examination bank (ข้อสอบกลาง) of สำนักงาน กสทช. (NBTC), Thailand, published openly in its E-Practice system. The three subject areas and the 60%-per-subject pass mark are from ภาคผนวก ฉ and clause 19(1) of the NBTC notification published in the Royal Gazette (ราชกิจจานุเบกษา เล่ม ๑๓๕ ตอนพิเศษ ๒๔๖ ง, 3 October 2018). Reproduced unchanged. GoExam is an independent practice site, not affiliated with NBTC. NBTC E-Practice (official source)
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