WPC GMDSS ROC (India) study guide
WPC GMDSS ROC (India) · Work through your exam, one topic at a time.
The GMDSS Radio Operator Certificate issued through India's Wireless Planning & Coordination Wing (WPC), Ministry of Communications, is the national credential that demonstrates competence to operate Global Maritime Distress and Safety System equipment on Indian-flagged vessels. Candidates usually hold or are working toward a certificate of competency and need the radio qualification to stand watches and handle distress traffic. The WPC GMDSS ROC (India) study guide has 12 sections and about 4,986 words.
01GMDSS System Architecture
The GMDSS is a ship-to-shore system: the ship alerts a shore authority, and that authority (an RCC) organises the rescue. Questions in this domain ask you to name the functional requirements, to place a ship in the correct sea area, and to say which equipment performs which function.
349 words, about 2 min02Sea Areas and Carriage Requirements
This domain tests SOLAS Chapter IV: who must comply, and which radio equipment a given ship must carry for the sea areas she trades in. Accuracy on tonnage thresholds and on conditional items (NAVTEX, EGC) is what separates a pass from a fail.
419 words, about 2 min03Distress, Urgency and Safety Communications
Priority, correct phrasing and correct procedure. Distress has absolute priority over all other traffic; urgency and safety rank below it but above routine.
398 words, about 2 min04Digital Selective Calling - Equipment, MMSI, Alerting and Watchkeeping
DSC is a digital calling system that sends a formatted alert or call to a specific station, a group, or all stations. The exam tests frequencies, the MMSI structure, the distress alert sequence, acknowledgement rules and watchkeeping, and the correct treatment of a false alert.
426 words, about 2 min05VHF and MF/HF Radiotelephony - Operation, Channels and Range
Practical operating knowledge: which channel or frequency to use for what purpose, transmitter power, propagation and range, and the calling and reply conventions. Questions frequently contrast VHF line-of-sight behaviour with MF ground wave and HF sky wave.
373 words, about 2 min06Satellite Communications (Inmarsat) and Maritime Safety Information
Inmarsat is the satellite provider recognised for GMDSS distress alerting and MSI in Sea Area A3. Questions cover the constellation's limits, the services that count for GMDSS, and the way distress alerts reach an RCC.
439 words, about 2 min07EPIRBs, SARTs and AIS-SARTs
Locating and alerting devices: how the 406 MHz EPIRB reaches the rescue services, and how the SART and AIS-SART let the rescuing ship or aircraft find the survival craft. A float-free satellite EPIRB transmits a digital alert on 406 MHz to the COSPAS-SARSAT system, which passes it through a Mission Control Centre to the responsible RCC.
470 words, about 2 min08NAVTEX
NAVTEX is the short-range, automatic, narrow-band direct-printing system for MSI in coastal waters. The exam tests frequencies, message types, station/time-sharing identifiers, and how a receiver filters what it prints.
403 words, about 2 min09SafetyNET and Reception of Maritime Safety Information
MSI is the GMDSS broadcast of navigational and meteorological warnings, forecasts and SAR information. It reaches ships by NAVTEX in coastal waters, by SafetyNET (Inmarsat Enhanced Group Call) in ocean areas, and by VHF/MF broadcasts from coast stations in A1 and A2.
404 words, about 2 min10Radio Regulations, Licensing, Frequencies and Watchkeeping Obligations
This domain moves from technique to compliance: the ship station licence, operator certification, authorised frequencies, watchkeeping duties, secrecy of communications and the penalties for misuse. In India the licensing and frequency authority is the Wireless Planning and Coordination (WPC) wing of the Ministry of Communications , which issues the ship station licence and assigns the MMSI; the GMDSS certificates are issued after examination under the same regulatory framework.
436 words, about 2 min11Batteries, Power Supplies, Antennas and Basic Fault-Finding
Practical reliability: reserve power capacity, battery care, antenna installation, and the first checks an operator makes before calling a technician. SOLAS IV/13 requires a reserve source of energy, independent of the ship's main power, capable of operating the radio installation for at least 1 hour where an emergency generator is fitted and 6 hours where it is not.
425 words, about 2 min12Radio Log, Records, False Alerts and Operational Safety Practices
Record-keeping and judgement. The radio log is legal evidence; false alerts are a serious operational and regulatory problem; and daily practice around the radio installation is inspected as much as it is examined.
444 words, about 2 min