Question and Answers

    Question
    marinetales May 18, 2021
    Close quarter is a situation between two vessels when action taken by one vessel may not be sufficient to avoid the collision. In rivers, harbours, and other inland waterways; close-quarters situations are unavoidable.
    marinetales May 24, 2021
    No the Rule 34(e) will not apply in Restricted visibility. Because for Rule 19 to be applied, the vessels are required to be navigating in or near area of Restricted Visibility. So, in simple words, when the visibility is obscured or vessels are navigating in areas or near areas where the visibility is restricted, only Rule 19 applies.
    marinetales September 9, 2020
    The best and perhaps the only way to reduce the squat is to reduce the vessel’s speed.
    marinetales May 24, 2021
    A safe speed is a speed less than the maximum at which the navigating officer can take proper and effective action to avoid collision and stop within a distance appropriate to the prevailing circumstances and conditions. Safe speed cannot be given a numerical value and it's value could be different in different circumstances (such as open seas or coastal waters or areas with high traffic density).
    marinetales August 28, 2020
    The Tidal Diamonds are the symbols marked usually on British Admiralty Charts that indicates the direction and speed of the Tidal Streams at particular location. The Tidal streams are given in the form of the table and tidal diamonds are marked in the first row. The Tidal diamonds are marked by purple color rhombus and contains Alphabetical letter starting from A, B, C and so on... The Tidal diamonds accompanies the position (mentioned in Latitude and Longitude) next to it and refers to the position on the chart on which the calculated tidal stream is expected.
    marinetales August 22, 2020
    Rule 13 (Overtaking) ALWAYS supersedes Rule 18 (Responsibility between Vessels). So, in this case it is the Responsibility of the Overtaking vessel (NUC Vessel) in this case to keep clear of you. Own vessel has to give ”wake up signal” of five short blasts on the ship’s whistle. If no action is taken by other vessel, give wide alteration to Port and take a round turn after passing by the stern of the NUC vessel.
    marinetales May 27, 2021
    We know that Polaris is situated NEAR to the north pole and NOT exactly on the north pole. Polaris is always located within 1 degree of the North Pole. Determining Latitude by polaris involves the use of GHA Aries which is measured with references to the CELESTIAL POLE. Since Polaris is not exactly located on the North Pole, 1 degree is subtracted while calculating the latitude from the polaris tables to adjust for the assumption which is taken in to account that polaris lies on North pole.
    marinetales August 23, 2020
    Steady order is usually given when the vessel is required to be steered on a certain course as ordered by the Master. (Eg Steady on Course 180 deg) Steady as she goes order is given when the vessel is required to keep on the course that she is steering CURRENTLY.
    marinetales August 23, 2020
    Following are the ways – 1. Electronic Position Fixing methods such as GPS 2. Radar Fix 3. Visual Bearing Fixes 4. Celestial Fixes (such as Long by Chron, Mer Pass, Polaris etc) 5. Horizontal Sextant Angles 6. Vertical Sextant Angles 7. Running Fix 8. Three point bearing
    marinetales August 30, 2020
    Cardinal Buoys are used to indicate the position of the hazard and direction of the safe water to which the vessel should pass. Cardinal buoys by their top marks indicate the direction of safety as a cardinal (compass) direction (north, east, south or west) relative to the mark. The presence of top mark helps the navigator in easily identifying the type of Cardinal Buoy and the direction of the safe water where the vessel must proceed. The "Top-marks" being clearly visible reduces the chances of error.
    marinetales August 24, 2020
    Not necessarily one will be able to identify AGROUND vessel, alone, by looking from astern. It is because there is a high possibility of mistaking it with vessel NUC making way. So, we have to look at other signs too. Most accurate way of determining the vessel is whether the vessel is having ground speed or not. Aground vessel will be having ground speed "zero" compared to NUC making way having certain amount of speed.
    marinetales August 23, 2020
    Collision happens when there is an structural impact between a vessel and another vessel (or FLOATING Object) Allision is the structural impact between a vessel and a FIXED object such as Bridge or Fender etc.
    marinetales May 17, 2021
    Pooping occurs mostly on ships ( with a low heightened poop deck) when the stern sea waves are coming from astern of the ship ( the ship has following seas) resulting in hitting the poop deck. This may result in swamping the poop deck repeatedly. Check the figure as shown-
    marinetales August 30, 2020
    The single and the most effective way of reducing the effect of squat on own vessel is to REDUCE THE SPEED of own vessel . The squat experienced is directly proportional to the SQUARE OF THE SPEED OF THE VESSEL. Hence reducing the speed has a greater impact on reduction of the squat.
    marinetales August 23, 2020
    On a nautical chart, the drying height is the vertical distance of the seabed that is exposed by the tide, above the sea water level at the lowest astronomical tide. On admiralty charts a drying height is distinguished from a depth by being underlined.
    marinetales May 19, 2021
    A buoy is a FLOATING mark that is secured to the seabed by mooring chains and a beacon is a mark that is permanently fixed to the seabed. A beacon is usually a FIXED mark such as a Lighthouse. Beacon usually transmit radio signals.
    marinetales May 22, 2021
    Following are the duties of lookout on bridge: 1. Reporting any vessel target followed by the bearing of the target vessel by sight 2. Reporting the aspect of the target vessel 3. Reporting and sound signal and approximate bearing by hearing 4. Looking out for any floating debris, objects and navigational hazards 5. Looking out and reporting for any unidentified objects
    marinetales August 23, 2020
    When a ship is maneuvering in/near extremely shallow waters such as near a shoal she is likely to take a sudden sheer (sheer means quickly changing of course), first towards the shoal/shallow patch and then violently away. This is called smelling the ground.
    marinetales May 19, 2021
    Following factors can effect the turning circle of the vessel: 1. Currents 2. Wind 3. Sea state 4. Condition - loaded, partially loaded or ballast 5. Speed of the vessel 6. UKC
    marinetales May 20, 2021
    Contents of Wheel house poster also called Maneuvering Booklet : 1. Name of Ship, Call Sign, Gross tonnage and Net tonnage, Displacement, Deadweight and Block Coefficient (at Summer load draft) 2. Forward and Aft draft at which the Maneuvering data was obtained (Loaded and Ballast) 3. Steering particulars - Type of Rudder, Max Rudder Angle, Time hard over to hard over (with one power unit and both power unit), Minimum speed required to maintain course, Rudder angle for the neutral effect 4. Anchor chains on both port and starboard anchor and maximum rate for heaving the anchor 5. Propulsion particulars - type of engine, type of propeller 6. Engine order (dead slow, slow, full etc), their corresponding RPM Values and corresponding Speed obtained in both loaded and ballast. 7. Details of Bow and Stern thruster 8. Man overboard recovery turn and rescue maneuver details 9. Turning circle data at Max rudder angles (in loaded and ballast) 10. Track reach details in loaded and ballast 11. Stopping characteristics 12. IMO Visibility Criteria Attach find a sample of wheelhouse poster 3.
    marinetales August 23, 2020
    Following techniques will help you to determine the position using a lighthouse – 1. Taking a Radar Fix (if the Lighthouse is fitted with RACON or is Radar Conspicuous Object) 2. Visual Bearing 3. Vertical Sextant Angle 4. Running Fix 5. Three Point Bearing