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Sector 9. The Bismarck Archipelago

9.75 A string of islands, of which the largest and eastern-

most is Los Negros Island, extends E from the NE extremity of Manus Island and then curves around to the N and W, forming Seeadler Harbor. Lorengau Bay which is of commercial in- terest, Lombrum Bay and Papitalai Harbor, which are both military sites, indent the S shore of Seeadler Harbor. A number of coconut plantations are found along the shores of the harbor. Tides—Currents.—The tidal rise at MHHW is 0.8m. At

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MLLW,the rise is about 0.2m. There is little current in the harbor.

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Depths—Limitations.—Depths of 12.8 to 32.9m, inter-

spersed with coral reefs having depths of 0.9m to 7.3m, are found throughout the harbor. Depths of at least 15.2m are found in the wire-dragged entrance channel between the reef fringing Ndrilo Island and that fringing Hauwei Island. The passage between the reef fringing Pityilu Island and that fring- ing Hauwei Island has depths of 4.6 to 12.8m in the fair-way. Aspect.—Ndrilo Island and Hauwei Island are planted in coconut palms and are about 27m high.

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Rara Islet, densely wooded and about 37m high, is off the entrance of Lorengau Bay.

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Pityilu Island is low and has some buildings on it. There is an airfield on the island, which is reported as unusable. The NW end of Ndrilo Island is marked by a light close to an abandoned lighthouse.

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Point.

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Three conspicuous oil tanks are 0.3 mile WSW of Lombrum Pilotage.—Pilotage is not compulsory, but a pilot is avail-

able from Madang on 48 hours notice. Pilots board in the vici- nity of a position 0.9 mile, bearing 127° from the abandoned lighthouse on Ndrilo Island. No tugs are available.

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Anchorage.—Anchorage for a number of large ships is

available in an area about 15 miles long and from 2 to 4 miles wide. A great number of berths for all size ships have been established in the swept areas, which have been dragged to 6.1 to 15.2m. The holding ground is reported to be excellent, but a heavy swell sets into the harbor during the Northwest Mon- soon. Vessels wishing to anchor during daylight hours should arrive not later than 1 hour prior to sunset.

Anchorage for merchant vessels can be taken, in 16.5m, good holding ground, about 0.3 mile SW of Rara Islet. Anchorage for small vessels with local knowledge can be

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taken in Lombrum Bay and in Papitalai Harbor. There are two mooring buoys in Lombrum Bay.

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Bear Point.

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A recommended anchorage is 1.3 miles, bearing 210° from Directions.—Vessels should enter Seeadler Harbor by pass-

ing midway between the reefs fringing Ndrilo Island and Hau- wei Island. The E point of Rara Islet bearing 200° leads through this passage. Vessels bound for the anchorage off Lorengau Bay should continue on this course, which will pass E of a 4.3m shoal lying 1 mile N of Rara Island and W of a shoal extending WSW from Rara Island. The track then leads S to Nabu Wharf, passing either W or E of a shoal which is marked by beacons at its E and W extremities.

Caution.—Numerous charted submerged dangers are in Seeadler Harbor; these are hard to identify when the waters are muddy. Care must be taken when navigating outside of swept areas because undiscovered dangers may exist.

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Lorengau Bay is shoal, and it and Papitacai Harbor are en-

cumbered with shoals and fringed by a reef. 9.76 Lorengau (2°01'S., 147°17'E.) (World Port Index No.

56730) consists of Nambu Wharf, a short T-headed pier which extends from the end of a causeway projecting from Parendo Point; the berth is unsafe for working cargo; the berth has a depth of 5.1m alongside. Salesia Wharf stands 1.5 miles ESE of Nambu Wharf.

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A naval base situated at Lombrum (2°02'S., 147°23'E.) has

a wharf alongside, which vessels up to 183m in length, with drafts of 10.1m, may berth. A small oil pier is available in Pap- italai Harbor.

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See Pub. 120, Sailing Directions (Planning Guide) Pacific

Ocean and Southeast Asia for details on regulations pertaining to vessels in the waters of Papua New Guinea. The Quarantine Anchorage may best be seen on the chart.

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Hyane Harbor (2°03'S., 147°26'E.), on the E side of Los

Negros Island, is small and reef-fringed. The harbor is suitable only for small vessels with not more than 3m draft; with local knowledge they can anchor, in 27.4m, in the S part of the har- bor.

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The entrance channel, marked by buoys, is only 46m wide

and is 7.6m deep; considerable swell is reported outside the entrance during the Northwest Monsoon.

Islands and Dangers East and South of Manus Is- land

9.77 Nauna Island (2°12'S., 148°12'E.), the easternmost

of the Admiralty Islands, is about 131m high and densely wooded. It has a cliffy N coast and is fringed by reefs ex- tending about 183m offshore. A narrow sandy beach, with coconut palms, extends nearly around this small islet. A light is situated on the W side of the island.

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The Los Reyes Islands, comprising Mbatmanda Island and

Putuli Island, separated by a 1.5 mile wide passage, are about 17 miles NNW of Nauna Island. The islands are low, densely wooded, and about 49m high. The Los Reyes Islands have been reported to be 1.5 miles NE of their charted position.

Towi Island, small and of volcanic origin, is 4.75 miles WSW of Putuli Island. It is densely wooded and 46m high.

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Tong Island, flat, densely wooded, and about 18m high, is

8.5 miles WSW of Towi Island. A danger area, 1 mile in diameter, is centered about 2 miles ENE of Tong Island. Pak Island, 5 miles WSW of Tong Island, is about 21m high.

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The E and W ends of the island are forested and the area between is planted in coconut palms. The coasts are steep, rugged, and reef-fringed. A rock, with a depth of less than 1.8m, lies close W of the W end of Pak Island.

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Ulunau Island, small and reef-fringed, is separated from the

N side of the W end of Pak Island by a narrow passage. A small jetty stands on the S side of the passage.

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A shoal, with depth of 5.8m, is 1 mile NE of Ulunau Island.

A shoal, with a depth of 6.7m, is about 1.5 miles ENE of the same islet.

Small vessels with local knowledge can anchor, in 12.8 to 16.5m, a little over 0.5 mile E of Ulunau Island.

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