Ownship speed is 20.0 Knots and course is 245.4 degrees at beginning.
The situational awareness is:
• With three minutes vector length in 20.0 Knots, this vector is about 10 cables distance as above. (skill by knowing three minutes run)
• Ownship have two crossing vessel at starboard side (red circle), distance unknown. (sighted)
• One overtaken vessel at starboard side has slower speed. (skill by comparing vector length)
• Ownship have one crossing vessel at port side (green circle), distance unknown. (sighted)
• two overtaken vessels at port side slower than ownship. (skill by comparing vector length)
The situational awareness with 6 minutes speed vector is:
• There are 6 vessels inside the collision square (Orange square). (sighted)
• There is no time to remember what vessel is ahead or behind, what vessel is on starboard side or port side? (suspect)
• Ownship now knows that “It is Collision area to be avoided, not the vessels”(statement)
• Where to go for ownship? (suspect)
• To starboard side, One port side crossing vessel (green circle)will be at ownship starboard bow after 6 minutes which block ownship way to starboard side. ( sighted)
• To port side, two starboard side crossing vessel (red circle) will be at ownship bow after 6 minutes which will block ownship way to port side. ( sighted)
• To make a 360 degrees turn, many vessels inside the traffic lane. (sighted)
• Ownship has the option to reduce speed as fast as possible to arrive collision square later. (suspect)
After 01 minutes exercise time lapsed:
Ownship speed is 18.6 knots which decreased from 20.0 kts with engine output reduced twice 65% from beginning and further reduced to 35%.
Ownship course had altered 2.6 degrees starboard side to 248.0 degrees from 245.4 degrees with rudder cycle from “starboard 10”and “Hard Port “in last minute.
The situational awareness in 3 minutes speed vector is:
• Ownship reduced speed step by step with less engine output 35%. (sighted)
• Speed reduces 1.4 knots over one minute’s time. (sighted)
• Overall situation is hard to tell in this three minutes speed vector. (sighted)
The situational awareness in 6 minutes speed vector is:
• Ownship Speed reduces 1.4 knots is not enough? (sighted)
• Course alternation is good for crossing vessels, all crossing vessel will pass after 6 minutes. (sighted)
• Course alternation 2.6 degrees starboard side to 248.0 degrees is crossing overtaken vessel bow(sighted)
• Ownship speed is still too fast as ownship arrive collision square about the same time with crossing vessels. (sighted)
After 02 minutes exercise time lapsed:
Ownship speed is 16.5 knots which decreased from 20.0 kts with engine output reduced twice 65% from beginning and further reduced to 35% after 30 seconds.
Ownship course had altered 0.9 degrees starboard side to 248.9 degrees from 248.0, 245.4 degrees with rudder cycle from “starboard 10”and “Hard Port “ and “ Starboard 30,20,5 …”.
The situational awareness in 3 minutes speed vector is:
• Ownship reduced speed step by step with less engine output 35%. (sighted)
• Speed reduces 3.5 knots over two minute’s time. (sighted)
• Overall situation looks good in this three minutes speed vector. (sighted)
• All crossing vessels are about to pass ownship bow in next minute. (sighted)
• Overtaking vessels are in proper distance away. (sighted)
The situational awareness in 6 minutes speed vector is:
• Overall situation looks pretty mess in this 6 minutes speed vector. (sighted)
• The moral is “You don’t need to use too long speed vector while vessels are plenty.”(rule)
• Three minutes speed vector represent ownship collision risk with proper consideration in ship maneuvering. (rule)
After 03 minutes exercise time lapsed:
Ownship speed is 14.9knots which decreased from 16.5, 18.6, 20.0 kts with engine output reduced twice 65% from beginning and further reduced to 35% after 30 seconds.
Ownship course had steady in 249.3 degrees from 248.9, 248.0, 245.4 degrees in last minutes.
The situational awareness in 3 minutes speed vector is:
• Ownship reduced speed step by step with less engine output 35%. (sighted)
• Speed reduces 5.1 knots over three minute’s time. (sighted)
Overall situation looks good in this three minutes speed vector. (sighted)
• All crossing vessels are about to pass ownship bow in next 3 minute. (sighted)
• Overtaking vessels are in proper distance away. (sighted)
After 04 minutes 09 seconds exercise time lapsed:
Ownship speed is 13.7 knots which decreased from 14.9, 16.5, 18.6, 20.0 kts with engine output reduced twice 65% from beginning and further reduced to 35% after 30 seconds.
Ownship course had steady in 248.3 degrees from 248.9, 248.0, 245.4 degrees in 2 minutes.
The situational awareness in 3 minutes speed vector is:
• Ownship reduced speed step by step with less engine output 35%. (sighted)
• Speed reduces 6.3 knots over 4 minute’s time. (sighted with speed reduction rate of 1.5 Knots per minute)
Overall situation looks good in this three minutes speed vector. (sighted)
• All crossing vessels are about to pass ownship bow in next 2 minute. (sighted)
• Overtaking vessels has altered course to starboard side. (sighted)
The moral of this exercise is “ Once the situation seems impossible become much easier by speed reduction, especially for high speed vessel.”
End of Ex 05-01
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