Dangerous/critical period when sea comes from beam. | |
Wave group consists of about 8 waves. | |
Lull period 1-2 waves among wave groups. | |
Alter the vessel during lull period. | |
Before turning, inform all department heads, take necessary precautions. | |
No one is allowed on deck. | |
Understand turning ability of the ship. | |
Study wave development cycle carefully to find out calm period. | |
To minimize danger of being capsized or swamped, the timing of turn to be coincide with calmer waves when abeam. | |
Consider possibility of misjudgment of lull period and turning ability of the vessel. | |
About 2/3 waves before the calm wave, start turning slowly with extreme caution. | |
If turning misjudged, come back to previous heading. | |
If turning is correct, continue the turn as fast as possible. | |
When critical period is passed, increase the turning rate. | |
Steady to next course and observe situation carefully. | |
Adjust speed if necessary for following and quartering sea. |
Updated: Saturday, 15 September 2007