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Not familiar with this chart, but I think "Rk" in this situation probably does refer to actual charted rocks, not the nature of the seabed. See Chart No. 1, K-b and K-14.
A "Rk" symbol without anything special near it refers to the nature of the bottom. A "Rk" symbol next to a blue circle indicates an individual rock or rocky projection off of the surrounding substrate. Now that I look at it a bit more closely, one "Rk" with the red line going through it is the former, while the other appears to be the latter. However, in the case of the later the course doesn't go right through the indicted position of the rock(s), and the rock(s) should be several feet below the keel (10' depth vs a 6' draft). Still, I would have opted to take the mark to port, as the distances appear to be pretty tight in any case.
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Last edited by SlowButSteady; 10-04-2011 at 11:47 PM.