The plot is required and then the plot has to be checked by following it up by further observations.ĪRPA readings may not be accurate in the first set of figures, the ARPA also keeps predicting and updating the figures. Scanty Radar information – if the target has been observed once in a while then the assessment is not correct. Assumptions shall not be made on the basis of scanty information, especially scanty radar information. And this is termed as systematic observation.Ĭ. Radar Plotting of course is very helpful in assessing the above. The bearing may not be very accurate (see Radar) but over a period of time this in accurate bearing would still indicate whether such risk exists or not.
This implies that the Radar has to be used for long range scanning to detect the ships and do a radar plot to determine whether the ship would pose any hazard or not.įurther even if the ARPA is not working the bearing and distance off if plotted would give a fair idea of the risk of collision. The Radar should be used so long as it is functional to warn the watch keeper of the danger in as great a time interval as possible. Radar is an AID to navigation and its use today is mandatory and essential. Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. Taking all the above the watch keeper has to judge whether even a slight risk exists and if this slight chance does exist then he shall note that RISK does exist.ī. In doing the above the chart should be studied, since this will give an indication of the course that the other vessel may be following to either head to or from a port or TSS. Of course in judging such risk, he has to take into consideration the conditions at that time – state of sea, traffic density, visibility etc.Īll available means to assess the risk, means all that is available to the watch keeper – visual bearings, Radar tracking or observations and plot, sound signals, VHF traffic, and the like. If the watch keeper is in any doubt even the slightest, he should assume that such risk exists and would have to act according to the Rules. If there is any doubt such risk shall be deemed to exist.Ī famous sentence in the Master’s Night Order book was ‘Whenever in doubt, call me’. Every vessel shall use all available means appropriate to the prevailing circumstances arid conditions to determine if risk of collision exists. Section 1 - Conduct of Vessels in any Condition of Visibility Rule 7 : Risk of collisionĪ. ANNEX III – Technical Details of Sound Signal Appliances.ANNEX II – Additional Signals for Fishing Vessels Fishing in Close Proximity.Annex 1 – Positioning and technical details of lights and shapes.
POSER 7 CRASH VERIFICATION
Rule 23 – Power-driven vessels underway.Rule 19 – Conduct of vessels in restricted visibility.Rule 18 – Responsibilities between vessels.