4 Communications

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Grade 12 – Nautical Science
4 Communications

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Introduction to the Grade 12 content
Video tutorials - final Grade 12 exam papers
1 Navigation
1.1 Reduction of Sights
The spherical triangle
The Marcq St Hilaire method of sight reduction
Alternative method of obtaining the sun’s azimuth
Astro running fixes
1.2 Compass error by astronomical observation
The azimuth
The amplitude
1.3 Radar
Introduction to Radar
Use of (marine) radar
Typical radar system
Characteristics of a radar transmission
Possible shortcomings
Coastal navigation techniques
Blind pilotage techniques
Radar plotting
1.4 Electronic navigation systems
Introduction to electronic navigation systems
Gyro compass
Ship’s log
Echo sounder
Radar
Automatic Radar Plotting Aid (ARPA)
Automatic Identification System (AIS)
Global Positioning System (GPS)
Electronic Chart Display and Information System (ECDIS)
Radio direction finding system (Marine radio beacons)
Radar transponder beacons
Other electronic navigation systems
2 Seamanship
2.1 Stability of Vessels
Concepts and definitions
States of stability
Trim
Effect of the movement of cargo/ballast/personnel
Hull stresses
Loadlines and Zones
Freeboard and statutory freeboard
Zones/seasonal zones and area
Logbook entries
2.2 Certificates to be carried
3 Meteorology
4 Communications
4.1 Global Maritime Distress and Safety System (GMDSS)
Introduction to GMDSS
Concept
Marine communication areas
Operational details
Radio watchkeeping
GMDSS sub-systems
GMDSS functions
Minimum operator requirements for vessels
Knowledge requirements of officers
Availability of equipment
Non-GMDSS vessels and radio communications services
Maritime Mobile Service Identity (MMSI) numbers
Annexures associated with the exam videos

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September 24, 2020

Non-GMDSS vessels and radio communication services

It is compulsory for SOLAS vessels to have GMDSS equipment. This includes all passenger vessels and cargo vessels of 300 gross tons and above on international voyages. There are also a very large number of vessels that don’t undertake international voyages and do not have to comply with GMDSS, ie […]

September 24, 2020

Maritime mobile service identity (MMSI) numbers

Each GMDSS ship station is allocated its own unique nine digit MMSI number which is included automatically in each DSC call made by the station. Included in the MMSI number are the maritime identification digits (MID) which identify the country licencing/controlling the station. Three types of MMSI numbers are in […]