Preparis Island to Landfall Island - 401
Preparis Channels and Coco Islands
Preparis Island (14°53'N., 93°38'E.), 81m high, narrow, and wooded, slopes gradually to the sea. A shoal spit extends about 3.5 miles S from the S end of this island.  Preparis Island has been reported to be a good radar target up to 24 miles and has been reported to be identifiable with charted features by radar up to 22 miles.
Some islets lie on a reef about 1.3 miles W of Preparis Island.
A 12.2m high pinnacle rock lies on a reef about 4 miles SW of the S end of Preparis Island. A 1.8m high rock lies on a reef about 0.5 mile S of this reef.
Several coral heads, with depths of 3.7m and less, lie within 1.3 miles of the SE side of Preparis Island. A rock, awash, lies about 0.8 mile S of the N end of the island and 0.3 mile offshore. A pinnacle rock, with a least depth of 2.7m, lies 1.8 miles E of the N end of the island.
During the SW monsoon, anchorage can be taken off the E side of Preparis Island in depths of 21.9 to 25.6m. During the NE monsoon, anchorage can be taken on the opposite side of the island.
Preparis South Channel (14°30'N., 93°33'E.), which lies between Preparis Islands and the Coco islands to the S, has depths of 199.4 to 274.3m and a width of 34 miles between the dangers on either side.
A radar conspicuous wreck, stranded in 1980, lies at the W side of the islet 2.5 miles W of the S end of Preparis Island.
Coco Islands-Coco Channel
The Coco Islands consist of Table Island, Great Coco Island, and Little Coco Island.
Table Island (14°11'N., 93°23'E.), which is densely wooded on all except its SW side, appears as a flat, level surface with steep-to sides on all bearings. The island has been reported to be a good radar target up to 16 miles.
Slipper Island (14°11'N., 93°22'E.), 34m high and grass covered, lies about 0.2 mile NW of the NW end of Table Island. The two islands are connected by a drying reef with a stepping-stone causeway on it. A few trees lie near the summit of the island and a remarkable pillar rock lies near its W extremity. Foul ground extends 0.3 mile W and N from Slipper Island, and depths of 8.2m extend 0.8 of a mile NE from the island with depths of 3.6 and 5.5m over the outer end.
Numerous rocks and shoals, the positions of which may best be seen on the chart, lie off Table Island in depths of less than 18.3m. A detached 11.9m patch lies about 1.3 miles NE of the island, and irregular depths which cause tide rips, extend about 4.5 miles NE from the island.
During the NE monsoon, anchorage can be taken about 0.3 mile offshore in Table Bay, on the SW side of Table Island, in depths of 18.3m, rock, with the lighthouse bearing 012°. When anchoring, care is necessary neither to be too close to the reef, nor to far out where the currents are strong.
During the SW monsoon, anchorage can be taken about 0.4 mile off the N side of the island in depths of 16.5 to 21.9m, sand and rock, with the lighthouse bearing 180°. This anchorage is exposed.
In Table Bay a small, short jetty extends from the shore close S of the lighthouse. The channel approach to this jetty is marked by a white square board in line with the E white-washed gate of the lighthouse fence.
The landing place on the N side of the island is approached through a channel, about 91.5m wide at its outer end, and 45.7m at its inner end. Iron stakes mark the reefs on either side.
Marshall Channel (14°10'N., 93°22'E.), which lies between Table Island and Great Coco Island to the S, has depths of 5.5 to 18.3m in the fairway seaward of the fringing reefs. Strong currents set through this channel.
Coco Islands-Table Island
Great Coco Island (14°07'N., 93°23'E.), densely wooded and steep on its W side, slopes gradually to the sea on its E side. There are no off-lying dangers, but rocky foul ground extends 0.3 mile from its N end and 0.4 mile from its NW end.
Great Coco Island has been reported to be a good radar target up to 23 miles.
Pollock Bay (14°09'N., 93°23'E.) lies between the N point of the island and Pechee Point, about 1 mile to the SE. This latter point consists of a 45.7m high bluff topped by a few trees. The outer part of the bay has depths of 7.3 to 9.1m, whereas, its inner part is fouled by rocky reefs. Binnacle Rock, 4.3m high, lies on the outer edge of this reef.
Ford Bay (14°08'N., 93°23'E.), entered S of Pechee Point, has depths of 9.1 to 18.3m in its outer part, but shoals rapidly in its inner part. Rat Islet, 38m high and wooded, lies in the S part of the bay about 1 mile S of Pechee Point.
Anchorage can be taken in the outer part of Ford Bay in depths of 12.8 to 18.3m, about 0.7 mile N of Rat Islet. Shelter is provided against strong W winds.
Jerry Island (14°03'N., 93°22'E.), 30m high, is connected to the S end of Great Coco Island by a reef. Rocky ground, with uneven depths, extends about 2 miles S from Jerry Island.
Little Coco Island (14°00'N., 93°14'E.), densely wooded and fairly high, is separated from Great Coco Island and Jerry Island by Alexander Channel. This channel is free of dangers in the fairway, but strong currents and tide rips are encountered. Vessels using this channel should give the S end of Jerry Island a berth of at least 3 miles.
Irregular depths extend about 1.8 miles N, and foul, uneven ground extends about 4 miles S from Little Coco Island.
Investigator Patch (13°57'N., 93°16'E.), an area of shoal, rocky ground with a least depth of 2.7m, lies about 2 miles ESE of the S end of the island. Rocks, some of which are awash, lie on the foul ground which extends 4 miles S from the end of the island. Middle Rock, with a depth of less than 1.8m, lies 2 miles S of the above end of the island. Daphne Rock, with a least depth of 5m or less, lies 0.5 mile farther S. South Patch, with a least depth of 12.8m or less, lies 1.5 miles SSE of Daphne Rock.
During E winds, sheltered anchorage can be taken in depths of 16.5 to 21.9m, sand and mud, in Lambert Bay on the W side of the island. The bottom on the E side of the island is rocky and foul.
Coco Channel (13°48'N., 93°12'E.), which separates Little Coco Island from the Andaman Islands to the S, is wide and deep. The S side of the channel has irregular depths over a coral bottom. A 18.4m patch, which is marked by a heavy sea during strong winds, lies 13 miles SSW of Little Coco Island.
Andaman Islands
Landfall Island (13°39'N., 93°02'E.), 79.2m high in its N part, is fringed by a reef which extends up to 0.5 mile offshore in places. Landfall Rocks, 12.8m high, lie on the reef fringing the S end of the island.
East Island lies 0.8 mile E of Landfall Island. The intervening channel has a least depth 5.5m and provides anchorage to small craft. The anchorage is approached from the S.
East Island Light is shown from a white, round metal tower with red bands standing on the S summit of East Island; a racon is located at the light..  Channel Islet, a 29m high rock, lies 0.3 mile off the E side of Landfall Island near the edge of the reef which fringes that island.
Hickman Shoal (13°42'N., 92°59'E.), which consists of two small patches, lies about 2 miles N of the NW end of Landfall Island. The patches have a least depth of 8m. Several patches, with depths of 3.5 to 10.1m, lie between Hickman Shoal and Landfall Island. Shoals, with depths of less than 9.1m, lie within 2 miles NW of the N end of the island.
Ranger Reef (13°39'N., 93°06'E.), with a least depth of 1.8m, lies 2 miles E of the N end of East Island. Two 8m patches lie within 0.8 mile N of Ranger Reef. In heavy weather the reef is marked by breakers, but at other times it is difficult to identify.
Jackson Ledge (13°39'N., 93°07'E.), with a least depth of 3.2m, lies about 3.3 miles E of the NE end of East Island and is marked by tide rips. An 10.9m detached patch lies 3 miles ESE of the ledge. An 8.4m patch lies 2.5 miles NE of the ledge.