The red line is the track that the vessel leaves on the chartplotter and cannot be altered. I have traced Whisper's track and she crossed neither reef nor rock according to her chartplotter. You can see this in this range of 1/32 NM.
Apparently, what we have is the discrepancy between the chart datum of 1984 which precedes the introduction of GPS and its accuracy.
LESSON LEARNED: When in tight quarters--SLOW DOWN and WATCH YOUR DEPTH!
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