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Sector 4. The Kiribati Islands to the Marshall Islands

coral bank, has a swept width of 0.15 mile. The middle chan- nel, which is very narrow, lies between Entrance Island and the 1.5m coral bank. Shoal patches lie N of the swept area of the channel.

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Northwest Passage has a least charted depth of 16.5m in

mid-channel, and is swept to a depth of 15.9m over a least width of about 160m, with shoal heads swept to lesser depths, as indicated on the chart.

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Tides—Currents.—The tidal currents in South Pass attain a

rate of 2.5 knots at flood and a rate of 1.5 knots at ebb. They turn at about the time of HW and LW. At neap tides, the tidal currents may set inward continuously at a rate not exceeding 1.75 knots.

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The tidal currents in Northwest Passage attain a rate of 2

knots at flood and 2.75 knots at ebb. The tidal currents in the lagoon do not attain a rate of over 0.5 knot.

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Depths—Limitations.—The lagoon is cluttered with coral

heads and detached shoal patches. Swept areas of 11 to 15.9m, with shoal heads swept to lesser depths, are shown on the chart. Anchorage.—Large vessels can anchor in the swept area N

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and NE of Entrance Island. The approach can be made by passing W of Entrance Island. The dangers in this area are plainly visible under favorable conditions of light. Vessels with local knowledge can anchor, in 18.3m, good holding ground, among the reefs N of Likiep Island. A good lookout must be maintained in order to avoid the coral heads in the anchorage area. Many reefs and coral heads lie N and E of the swept area.

Small vessels with local knowledge have found excellent anchorage, in 15.5m, within 0.15 mile SW of the flagstaff on Likiep Island. Such vessels can anchor off the reef fringing the SW side of Lado Island (9°50'N., 169°19'E.).

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It is reported that good anchorage can be taken over a bottom

of coral and sand in the swept area of the NW part of the lagoon. There are numerous coral heads in this area.

4.57 Jemo Island (10°05'N., 169°32'E.), about 20 miles

NE of Likiep Atoll, is about 0.8 mile in extent and densely covered by trees. Steep-to reefs, on which the seas break heavily, surround the island and extend about 3 miles ENE from it. A depth of 34.7m lies 13 miles ENE of Jemo Island. Ailuk Atoll (10°12'N., 169°59'E.), about 42 miles NE of

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Likiep, consists of numerous islets, some 6.1m high and most of which lie on the E side of the atoll. There is an islet on each of the W and SW extremities. Ailuk Island, the SE extremity of the atoll, is the center of population and activities. There is a stone pier on the NW shore of the island and also a church.

Tides—Currents.—Strong tidal currents are reported in the entrances of the atoll. Both flood and ebb currents attain a rate of 1.75 knots at springs. The tide turns at about the time of HW and LW.

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Depths—Limitations.—The lagoon is studded with reefs,

coral heads, and pinnacle rocks. It should be navigated by vessels having local knowledge and then under only the most favorable conditions.

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Anchorage.—The anchorage areas are poorly sheltered and

their approaches are studded with shoals and coral heads. Winds of force 4 are not uncommon.

Small vessels with local knowledge can anchor, in 29.3m, about 0.5 mile NW of the lagoon side of Ailuk Island.

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Directions.—The three main entrances are located on the W

side of the atoll. Erappu Channel (10°20'N., 169°55'E.), about 4 miles NNE of the W extremity, is the best passage into the lagoon. It is about 0.1 mile wide and, although the depths are considerable, the fairway is tortuous, being divided into several branches by shoals and sunken rocks.

4.58 Marok Channel, about 1.5 miles N, is narrow but

straight and deep. Eneneman Channel, about 2 miles farther N, is deep and has some shoal reefs in its inner part.

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Mejit Island (10°17'N., 170°53'E.), about 52 miles E of

Ailuk Atoll, is nearly 1.75 miles long and fringed by a very steep-to unbroken reef. The N half of the island is flat and the S half is undulating. The entire island is covered with palms and breadfruit trees. A shallow inlet on the W side divides the island into two parts. Landing may be affected abreast the trader’s station at the S end on the W side of the island.

4.59 Taka Atoll (11°05'N., 169°38'E.) lies 40 miles NNW

of Ailuk Atoll. It has six small islets on its barrier reef. They are uninhabited and are wooded. Taka Passage, on the SW side of the atoll, is about 90m wide and has a least depth of 8.2m. Dangers lie within the entrance and throughout the lagoon. The pass should only be used by small vessels with local know- ledge under the most favorable of conditions. Anchorage is not recommended.

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Utirik Atoll lies about 4 miles E of the NE extremity of Taka

Atoll. Aon Island (11°13'N., 169°46'E.) is the SW extremity of the atoll and is covered with coconut palms. Utirik Island, the E extremity of the atoll, is the site of a village and center of all activities. Shoal reefs extend a considerable distance off and many reefs front the lagoon side of Utirik Island. A long sandspit extends W from the island. The lagoon is studded with dangers. Uncharted reefs may exist, and the charted position of some of the dangers may be inaccurate. The atoll was reported to be a good radar target up to 14 miles distance from the E and South.

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Depths—Limitations.—A least depth of 5.2m is reported in

Utirik Passage, near the W extremity of the atoll. Many coral heads, with depths of 4.1 to 5.5m, lie in or near the fairway. Directions.—Utirik Passage is difficult to navigate as the

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reefs near it are hard to identify and there are no good land- marks in the area. Small vessels with local knowledge should only attempt to enter the passage under the most favorable of conditions. The transit should be made at half tide. Such ves- sels should proceed at slow speed as the reefs are not identi- fiable until close aboard; due allowance must be made for the effects of winds and currents. Navigation in the lagoon is diffi- cult.

4.60 Bikar Atoll (12°11'N., 170°06'E.) lies about 55 miles

NNE of Utirik Atoll. There are numerous islets, covered with trees, nearly all of which lie on the reef on the E side of the atoll. Light scrub bushes are found on the outer fringe of the islets, thickening to heavy undergrowth towards the middle. Numerous birds and turtles are found on the islets. Jabwelo Island (Jaboerukku Island) (12°15'N., 170°08'E.) was visible 12 miles from NW. The island was picked up by radar at about the same time.

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