SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
SUB-COMMITTEE ON STABILITY AND LOAD LINES AND ON ...
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Ref.: 391/09 and 520/09<br />
BSU<br />
Bundesstelle für Seeunfalluntersuchung<br />
Federal Bureau of Maritime Casualty Investigation<br />
3.2.3 Recordings of the voyage data recorder (VDR)<br />
The CCNI GUAYAS is fitted with a 100 G2 voyage data recorder made by the<br />
company Rutter. The downloaded data were available for the analysis of the<br />
accident. The recorded radar images, positions, speeds, headings and the audio<br />
recordings are consistent with the witness statements.<br />
From the exported VDR data it is apparent that the vessel was proceeding at a very<br />
low speed of about 2 kts over ground at the time of the accident. The times are<br />
stored in the VDR in GMT/UTC. The time of the accident 1618 (GMT) is equal to<br />
0018 local time (Fig. 6).<br />
350,0<br />
Heading, SOG and und COG der of the CCNI CCNI GUAYAS GUAYAS am 14.09.2009 on 14/09/2009 (GMT) (GMT)<br />
3,50<br />
300,0<br />
3,00<br />
Course Kurs [Grad] [deg.]<br />
250,0<br />
200,0<br />
150,0<br />
100,0<br />
2,50<br />
2,00<br />
1,50<br />
1,00<br />
Speed[knots]<br />
Geschwindigkeit [Knoten]<br />
50,0<br />
0,50<br />
Time Unfallzeitpunkt of the accident 16:18 1618 (GMT) [GMT]<br />
0,0<br />
0,00<br />
16:10 16:11 16:12 16:13 16:14 16:15 16:16 16:17 16:18 16:19 16:20 16:21 16:22 16:23 16:24 16:25<br />
Time Uhrzeit [GMT] [GMT]<br />
Heading [Grad] [deg.] COG [Grad] [deg.] SOG [Knoten] [knots]<br />
Figure 7: Analysis of the VDR data<br />
The heading and the course over ground (COG) differ substantially from each other,<br />
in the order of 90°-100°. This means that the vessel must have had considerable<br />
problems in actually keeping her course. On the following chart, Figure 8, the<br />
heading is marked as a solid line and the course over ground (COG) as a dashed<br />
line. These variations can be explained by the load condition. The vessel had no<br />
cargo on board and sailed with ballast; due to the low draught, her immersed surface<br />
area was minimal in relation to her windage area. Added to that, due to the<br />
immersion of the vessel the semi-balanced rudder offered little effective rudder area,<br />
respectively, left the water at times, due to which a propeller flow was virtually<br />
absent. It was necessary for the vessel to steer a particular course for practical<br />
reasons; however, this was not steerable and could not be maintained.<br />
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