Date: 1878
When abreast Carndu point, keep Tetterdu point well open south of the Cam Barges to avoid the Lelland (Rennell), after which the shore may be approached to a quarter of a mile.  After passing St. Clements island, bring Trithal engine house in line with York house, N. -l W., and it will lead eastward of the Low Lee and Cam Base Rocks.  The best anchorage is in about 9 fathoms, with the tower on mount St. Mi chael's in line with St. Hilary church spire bearing E. |- N. ; and the beacon on the Gear rock in line with the pier lighthouse N. by E. E. The anchorage for coasters is farther to the westward in Gwavas Lake in about 4| fathoms, with the centre of St. Clements island in line with Penlee point, S. by W. \ W. In approaching the bay from the southward, when between Carndu and Cuddan points, and proceeding in the line towards Gulval at the head of the bay, the soundings will gradually decrease from 20 to 9\ fathoms at low water.