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Digital Selective Calling (DSC) Background DSC DSC system is used for calling:– A particular ship– A particular coast station– A group of ships– All ships The system can be used from:– Ship to shore– Shore to ship– Ship to ship Ships must be fitted with a mandatory DSC equipment applicable to the sea area in…
Before we start with the situations, we need to focus on some important Rules andPhrases and they are: THE RULES: Rule 8 (f), Rule 9, Rule 10 and Rule 18. All the rules mentioned above have a connection between them and it will be explained in the examples later 8 (f) (i). A vessel which,…
Wheel over positions should be determined from the ship’s manoeuvring data and marked on the chart. Suitable visual & radar cues should then be chosen to determine when the ship is at the wheel over position. The best cues for large alterations of course consist of Parallel Indexes or visual bearings parallel to the new…
How would you remove an air bubble from the liquid magnetic compass? Answer: Invert the compass bowl in the gimbal arrangement to bring the expansion chamber uppermost. Undo the screw cap of the chamber and top up the fluid in the bowl with distilled water. Thisaction will fill the bowl, forcing out the air bubble….
What is Aspect? Aspect of a target vessel is the relative bearing of the Own vessel from the Targetvessel. OR The angle between target vessel’s course and the theoretical line of sight.It is expressed as RED or GREEN In a WOA Triangle that we make for radar plotting WO is Way Own Own Ship’s Course…
A. Which stars will be within a certain hour angle of the observer’s meridian at a given time? 1. Find out the SHA of an imaginary star which is on the observer’s meridian. The SHA of a star onobserver’s meridian can be obtained by keeping LHA Star= 0° or 360° .2. Add and subtract the…
Explain the basic properties of a free gyroscope Gyroscopic Inertia: Precession: With reference to marine gyro compass, briefly explain the following: Drifting Tilting Drifting & Tilting: How a free gyroscope is converted into a north seeking device Top Heavy Control Force Path traced by a North seeking gyro: Operating principle and care of gyro compass…
Buoyage Module Introduction – Interest and Need In previous lessons we have looked at how to fix the ship during the daytime using a number of differing means. There are a number of other aids by which to keep a ship safe and we will look at these now. First we will look at the…
STEERING PROCEDURES Introduction All steering systems involve sending rudder command signals from the position where the vessel is navigated to the steering gear compartment where the machinery for controlling rudder movement is located. These rudder commands may be manually generated by a pilot/helmsman or electronicallyvia an automatic pilot. The method of steering the ship is…
Updating ENC Data: ENCs are updated by weekly ‘Notices to Mariners’ issued by Hydrographic Offices / Regional ENC co-ordination centers ( RENC) and corrections are received on the vessel either by email or data file (AVCS DVD). The actual updating is either applied to the ECDIS chart database automatically or by the user. The ECDIS…