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The abbreviation is a descriptor of the bottom, not of an isolated hazard. Go to U.S. Chart No. 1
Yep. The "Rk" refers to the condition of the bottom, not a big ol' rock sticking up.
However, a slight detour to the outside of that mark would cost you no more than a few minutes sailing time. Also, being outside of the mark would give you more room (and time) to deal with any problems; particularly if you had an equipment failure, or traffic to deal with (you might not have been the only vessel cutting it tight around that point that night), or whatever, at just the wrong moment.
Giving yourself a bit more margin for error is always prudent.
Never forget them. Do something to prevent it from happening again.
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