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sailed4seas talk 28 How to judge the safe course to steer
The moral is “ Speed reduction is more effective to avoid high speed vessel collision”. (rule) New collision risk aroused. Where is it? (suspect) How can we detect it?
How to judge the safe course to steer
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sailed4seas talk 28 How to judge the safe course to steer
After 05 minutes 00 seconds exercise time lapsed:
Ownship speed is 11.0knots which decreased from 12.6, 14.5, 18.6 kts with engine output 15% from beginning and further reduce to 0% last minute. Ownship course had altered 1.5 degrees starboard side to 069.5 degrees from 067.9, 066.4, 063.8 degrees with rudder order “Port 20”over last 40 seconds. The situational awareness is: Two vessels in Orange Square are passed. (sighted) Ownship reduced speed decisive with less engine output 15% from beginning and further reduced to 0%. (sighted) Speed reduces 7.6 knots over 5 minute’s time. (sighted) The distance creates from last 5 minutes decisive engine output reduction is about 3.16 cables. ( skill by calculation, 7.6/2 is average speed reduction, multiple 5 minutes run = 3.16 cable) This extra distance 3.16 cable keep ownship sail behind the collision point of other vessels. (statement) Other ship arrive the collision point is still the same time as the exercise begin. (statement) Only thing changed in this scenery is ownship about to arrive collision point later. (sighted) Cargo vessels NO. 21 in red circle is about to pass ownship bow after one minute. (sighted) Ownship is about to arrive this collision point 4 minutes later.(sighted) The time lapses compared with scenario in beginning is 3 minutes. (sighted) Tanker No.7 in yellow circle is about to arrive collision point after 3 minutes. (sighted) Ownship is about to arrive this collision point 8 minutes later.(sighted) The time lapses compared with scenario in beginning is 5 minutes. (sighted) Ownship had reduced same speed for both vessels, why the time lapsed is different? (suspect)
The moral is “ Speed reduction is more effective to avoid high speed vessel collision”. (rule) New collision risk aroused. Where is it? (suspect) How can we detect it? (suspect)
http://sailed4seas.pixnet.net/blog/po...
After 05 minutes 00 seconds exercise time lapsed:
Ownship speed is 11.0knots which decreased from 12.6, 14.5, 18.6 kts with engine output 15% from beginning and further reduce to 0% last minute. Ownship course had altered 1.5 degrees starboard side to 069.5 degrees from 067.9, 066.4, 063.8 degrees with rudder order “Port 20”over last 40 seconds. The situational awareness is: Two vessels in Orange Square are passed. (sighted) Ownship reduced speed decisive with less engine output 15% from beginning and further reduced to 0%. (sighted) Speed reduces 7.6 knots over 5 minute’s time. (sighted) The distance creates from last 5 minutes decisive engine output reduction is about 3.16 cables. ( skill by calculation, 7.6/2 is average speed reduction, multiple 5 minutes run = 3.16 cable) This extra distance 3.16 cable keep ownship sail behind the collision point of other vessels. (statement) Other ship arrive the collision point is still the same time as the exercise begin. (statement) Only thing changed in this scenery is ownship about to arrive collision point later. (sighted) Cargo vessels NO. 21 in red circle is about to pass ownship bow after one minute. (sighted) Ownship is about to arrive this collision point 4 minutes later.(sighted) The time lapses compared with scenario in beginning is 3 minutes. (sighted) Tanker No.7 in yellow circle is about to arrive collision point after 3 minutes. (sighted) Ownship is about to arrive this collision point 8 minutes later.(sighted) The time lapses compared with scenario in beginning is 5 minutes. (sighted) Ownship had reduced same speed for both vessels, why the time lapsed is different? (suspect)
The moral is “ Speed reduction is more effective to avoid high speed vessel collision”. (rule) New collision risk aroused. Where is it? (suspect) How can we detect it? (suspect)
http://sailed4seas.pixnet.net/blog/po...