An indifferent anchorage in NW weather may be had under Point Grenville by vessels of moderate draft, but the depths compel anchoring at such a distance from the beach that little shelter is afforded. The anchorage is in 4 fathoms, sandy bottom, with the inner extremity of the point bearing 338°, and Grenville Arch bearing 239°.
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Point Grenville is a broken rocky promontory with nearly vertical whitish cliffs over 100 feet high. Numerous rocks extend for some distance off the point. Grenville Arch, dark in color, 83 feet high, is the outer and more prominent of two rocks lying W of the point; it is over 0.5 mile SW of the inner extremity of the point. The arch lies E and W. A rock that uncovers is 400 yards NW of Grenville Arch. The W rock, off the W end of the point, is 200 yards off the cliff and 92 feet high. There are several rocks inside of it, but none outside. Two rocks, over 90 feet high, are 400 yards S of the S extremity of the point.