Caution.—Care is necessary when approaching Palmyras Shoals from the E, because the depths decrease rapidly and soundings will give no warning of the proximity of these dangers.
Tidal currents in the vicinity of Palmyras Shoals set at a rate of 2 knots at springs. On the NE side of the shoals, the flood sets to the NW and the ebb to the SE. At the S end of these shoals the flood sets to the N and the ebb sets to the S.
From the end of June to the end of November, there is little or no flood or W current off Palmyras Shoals, except at spring tides; a strong outset is experienced from the rivers during freshets.