Ror card- power driven can see both side lights vessel 4 points stb bow 4 miles. action ?

8.72 K
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Since both sidelights can already be seen so you are already ahead of the other vessel and hence no cation needed now and can continue on the same course and speed.

24
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Since the vsl is 4nm from own vsl well the action depend on what speed both the vsl is doing.

136
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No ACTION REQD ....MAINTAIN COURSE AND SPEED ........