Sailing Guide

Tanjung Jamboaye to Tg Sinaboi (NE Sumatra)

Tanjung Jamboaye to Tg Sinaboi (NE Sumatra)



The coast between Tanjung Jambuair and Ujung Tamiang about 69 miles SE, is plain, with few prominent features.
From February through May the high mountains in the interior are occasionally visible. During the rest of the year they can usually be seen in the morning. Many of the peaks of the ranges are prominent, and serve as useful landmarks.

Several small rivers flow into the strait along this section of coast. Small, shallow draft coastal vessels use these small rivers.

Between Ujung Tamiang and Tanjung Tanjung, about 96 miles SE, and then to Tanjung Sinaboi, about 115 miles farther SE, the low swampy coast is intersected by numerous small rivers, few of which are navigable. High mountain ridges rise in the interior and are clearly visible.

The depth curves generally follow the contour of the coast with the 10m curve lying about 1 to 5 miles offshore, except in the bays and inlets.

The SE part of the Strait of Malacca constricts to a width of 37 miles between Pulau Sinaboi and Tanjong Ru, on the Malaysian coast. The fairway is fouled by a series of narrow detached banks with depths of 11m and less.


Although the Strait of Malacca is within the limits of the Northeast Monsoon and Southwest Monsoon of the Indian Ocean, the winds are variable because of the high land on both sides. Land and sea breezes are regular on both coasts. In the offing, the monsoons are only regular when they are at their height in the adjacent sea area. However, the wind is moderate in the strait and only lasts for part of the day.
The monsoons become more regular near Singapore.
Between Acheh Head and Ko Phuket, the Southwest Monsoon commences in the latter part of April or the early part of May, and ceases in October. Calms and variable winds frequently prevail in November.
The Southwest Monsoon seldom blows far into the strait.
During this season, variable winds, chiefly from the SE and SW, prevail in the middle of the strait, with periods of long calms.
On the Sumatera side, light winds and calms prevail, and heavy squalls from the land are experienced during the night.
Fewer calms are experienced on the Malayan side and there are seldom any squalls. Variable land and sea breezes are usually experienced.
During the Southwest Monsoon, the weather is generally cloudy and stormy especially when the monsoon is at its peak.
Sumatras, or squalls from the SW, are more common during the Southwest Monsoon than during the Northeast Monsoon.
They generally occur during the first part of the night and are accompanied by sudden severe winds, with thunder and lightning.
They are more frequent on the N coast of Sumatera and along the Malaysian coast between Parcelar Hill and the Karimum Islands. Here they usually blow for 6 to 8 hours at a time as a strong, or moderate gale. Their characteristic is that of an arch squall.
Northwesters are not as frequent as the Sumatras. They are most common during the Southwest Monsoon and occur in the NW part of the strait but sometimes are felt as far SE as Singapore Strait. Severe high winds blow at the beginning of the storm but their strength soon abates. They are generally preceded by a black cloud arch, which rises rapidly from the horizon toward the zenith and are usually accompanied by thunder, lightning, and heavy rain.
The Northeast Monsoon prevails in the W entrance of the Strait of Malacca from November to April, which is considered the fair season. The weather is more settled at this time. There are seldom severe squalls and there is less thunder, lightning, and much less rain than in the other season.
In November, the winds are variable, frequently from the NW and W, although occasionally the NE winds set in November.
From this period to March, the Northeast Monsoon is the strongest, but at times NW and W winds of 1 or 2 days duration have been experienced in every month when the Northeast Monsoon should prevail.
Late in March, the NE and N winds become light and variable, with strong land breezes at night. On the Malaysian side these breezes commence between 2000 and 2200 and last for 4 or 5 hours, sometimes blowing all night.
This is generally the case between Mount Formosa and Cape Rachado. Calm winds are less likely to exist on the Malaysian side than on the Sumatera side of the strait.


The Strait of Malacca is relatively shallow, with the greater part of the area having depths of less than 73m. The main movement of water is from tidal influences.
Throughout the year, there is a residual predominantly NW current in the strait.

During the NW monsoon, part of the S current in the South China Sea rounds the S extremity of the Malay Peninsula and sets NW through the Strait of Malacca. During the period of the Southwest Monsoon, part of the current which flows through Karimata Strait and into the South China Sea, branches off to the NW into the Strait of Malacca. This NW current is also present during the transition months of April and October although at these times it becomes weaker and less constant.
As the NW monsoon becomes well established there is some evidence in some of the winter months for an counterclockwise circulation in the N parts of the strait, N of about 3°N. This circulation weakens during the April transition.
When the Southwest Monsoon becomes established, a clockwise circulation probably results over the same area during the period June to October, with a maximum effect in August.

Though the predominant direction in the strait is NW, currents from all directions have been reported and the percentage frequency of the predominant flow is never high.

The current is most constant during the period January to April and is least constant from May to August. A number of observations, report rates of less than 1 knot.
Some have been reported more than 1 knot and no currents have been reported in excess of 2 knots.
The tides on the coast of Sumatera covered by this sector are chiefly semi-diurnal in character. However, on the N and NE coasts the diurnal tidal system of the South China Sea is felt at times, and when the highs and lows of both systems coincident springs, greater highs and lows are experienced.
The flood tidal current sets E on the N coast of Sumatera; the ebb tidal current sets W. At springs the current rarely exceeds 2 knots; at neaps they are sometimes imperceptible, except at the points or over banks and narrow channels.
The currents are also affected by the constant current out of the Strait of Malacca, which takes a W direction along the N coast, through Malacca Passage, and out through Bengal Passage, so that for the greater part of the year the ebb current is longer and stronger than the flood current.

As a result of the prevailing wind, when the water is rising or falling during the NW monsoon, there may be no E set for a day or more; conversely, the flood or E current runs longer and stronger during the Southwest Monsoon.

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Sites around Tanjung Jamboaye to Tg Sinaboi (NE Sumatra)
Flying distances - Direct line

Tanjung Perling to Tg Siapiapi (NE Sumatra)

The coast between Tanjung Perling and the mouth of the Sungai Serdang, about 8 miles SE, consists of mud and mangroves but from there to Teluk Mengkudu, about 18 miles farther SE, there is a considerable amount of sandy beach and high casuarina trees. Between the mouth of the Sungai ...
23 Jan 12

Tanjung Siapiapi to tg Sinaboi (E Sumatra)

The coast between Tanjung Siapiapi and Tanjung Pertandangan, about 20 miles SE, is indented by a large bay fouled by shoals.
Several navigable channels lead through these shoals to the mouths of the Sungai Kuala Kualu and the Sungai Panai.  Tides—CurrentsBetween Tanjung ...
23 Jan 12

Tanjung Tanjung (E Sumatra)

The river which flows into the strait at Tanjung Tanjung has a narrow entrance and shallow depths.
Tanjung Tanjung is low but can be identified by its white sandy beach and high trees.
A strong current sometimes sets here along the coastal bank. Vessels when crossing the mouth ...
23 Jan 12

Pulau Pandang (E Sumatra)

Pulau Pandang (3°25'N., 99°45'E.) is almost entirely surrounded by a coral reef with some above-water rocks. A foul area was reported to lie about 9 miles E of the island.
A light is shown from Pulau Pandang.The island is hilly and covered with virgin forest, nice for small ...
25 Jan 12

Tanjung Tiram (Bagan) (E Sumatra)

Between Tanjung Tanjung and Tanjung Tiram, about 9 miles SE, the coast is bordered by a white sandy beach except for a bank of mud and mangroves about 2 miles S of Tanjung Tanjung.
A light is shown from Tanjung Tiram.
23 Jan 12

Pulau Salahnama (E Sumatra)

Pula Salahnama (3°20'N., 99°43'E.) is densely wooded;its rocky sides rise steeply from the sea. An above-water rocklies close N of the island and a similar rock lies about 0.5 mile
S of the island.
Anchorage can be taken about 1 mile from the NW and SE sides of Pulau Pandang ...
25 Jan 12

Teluk Langsa (NE Sumatra)

Teluk Langsa (Langsa Bay) entered between Ujung Perolin and Tanjung Langsa, about 5 miles SE, is fouled by numerous shoals which are intersected by narrow channels.
The bay is easily identified by the rising ground SWof it against which the island of Pulau Telagatujoh, close NW ...
21 Jan 12

Tanjung Tambuntulang (E Sumatra)

Tanjung Tambuntulang, about 11 miles ESE of Tanjung Tiram, is a low (3 m above sea level) overgrown point.
The Sungai Tambuntulang discharges close W of the point and is marked by the village of the same name.
Tambuntulang Bank, with depths of from 1.8 to 5.5m and fairly steep-to, ...
23 Jan 12

Tjung Perling (NE Sumatra)

Tanjung Perling is located in the area of Utara in Sumatera with an average elevation of 103 m above the sea.
The coast between Tanjung Perling and the mouth of the Sungai Serdang, about 8 miles SE, consists of mud and mangroves but from there to Teluk Mengkudu, about 18 miles ...
22 Jan 12

Belawan Harbor (NE Sumatra)

Belawan, the most important port in Sumatera, lies at the confluence of the Sungai Belawan and the Sungai Deli about 8 miles S of the lighted approach buoy. Ample, modern alongside berthing facilities are available for handling all classes of ocean-going vessels capable of transiting ...
22 Jan 12

Sungai Deli NE Sumatra)

The entrance of the dredged channel leading to the Sungai Deli leads through these shoals to Pulau Belawan which has the port of Belawan on its N side.
The Sungai Deli has two entrances separated by Pulau Belawan.
The Sungai Belawan, the N channel, has the port of Belawan along ...
22 Jan 12

Sungai Asahan (E Sumatra)

The Sungai Asahan is entered between Tanjung Napal, 10 miles SE of Tanjung Tambuntulang, and Tanjung Jumpul, about 2 miles to the SE.
These points and the coast in the vicinity are low, muddy and overgrown with mangroves.
The channel is marked by buoys and beacons.
Jumpul ...
23 Jan 12

Pulau Jarak (K Sembilan) (Malaysia)

Pulau Jarak, lying near the middle of strait of Malacca about 25 miles W of Kepulauan Sembilan, is a precipitous thickly-wooded island. Pulau Jarak was reported to be a good radar target.The flood current sets SE and the ebb NW, at a rate of about 1,5 knots, in the vicinity of the ...
23 Dec 11

Tanjung Beting Camar (NE Sumatra)

Tanjung Beting Camar, which is tree-covered, stands 1.2 miles SE of Sungai Nipah Larangan. The coast between this point and Tanjung Belawan, about 6.2 miles SSE, has been reported to be radar conspicuous.Between Tanjung Beting Camar and Tanjung Perling, about 10 miles SSE, the coast ...
22 Jan 12

Ujung Ahu (Ahoe) (NE Sumatra)

Ujung Ahu (Og Ahoe), about 8 miles SE of Kuda Pusung, can only be identified from the E by the casuarina trees.
22 Jan 12

Tanjung Siapiapi (E Sumatra)

The coast between Tanjung Jumpul and Tanjung Siapiapi, about 9 miles SE, is bordered by a mudbank with depths of less than 1.8m. This bank extends up to 5.75 miles off the former point and 2.5 miles off the latter point.
There are some fishing huts but few objects for identifying ...
23 Jan 12

Pulau Pangkor (Malaysia)

Off the coast of perak State, north of Selangor , lies a cluster of fabulous islands with unquestionably some of the best coves and beaches on the western coast of peninsular Malaysia.
Among them, two islands predominate in terms of accessibility, infrastructure and development ...
21 Dec 11

White Rock (K Sembilan) (Malaysia)

White Rock was reported to be a good radar target up to 13 miles. A light is shown from White Rock.
A dangerous wreck lies about 9 miles, bearing 260° from White Rock; a racon is situated at the light.
23 Dec 11

Tanjung Pertandangan (E Sumatra)

Between Tanjung Pertandangan and Tanjung Sinaboi, about 56 miles ESE, the only points of identification are the river mouths.
The mangrove covered coast is mostly muddy and low lying. The coastal bank, as far out as the 10m curve, is marked by fishing stakes and enclosures. Fishing ...
23 Jan 12

Pulau Agas (K Sembilan) (Malaysia)

Pulau Agas, the N of Kepulauan Sembilan, lies about 7 miles S of Southeast Point.
The N group consists of four islets and a rock; the S group consists of six islands and two off-lying rocks, all within a 6 mile radius.
Caution.—If approaching from S at night between the mainland ...
23 Dec 11

Pangkalan Oil Terminal (NE Sumatra)

Pangkalan Oil Terminal is situated 9.5 miles offshore in the outer approaches to Teluk Aru. The terminal consists of a SPM, connected to the shore by a submarine pipeline, which is marked by several special purpose buoys.
Winds—WeatherThe weather is normally fair with moderate ...
22 Jan 12

Sungai Bernam (Perak Malaysia)

The Sungai Bernam (Bernam River) is located about 12 miles SSE of Tanjong Beras Basah. It is located between the Malaysian states of Perak and Selangor, demarcating the border of the two states.Tidal currents are strong in the river and only small craft with local knowledge should ...
24 Dec 11

Pulau Tukun Perak (Faiway Rock) (Malaysia)

Pulau Tukun Perak (Fairway Rock) 5.5m high lies about 4 miles SSW of Southeast Point on Pulau Pangkor.
A wreck, with a depth of 9.5m, lies 1.75 miles ENE of Pulau Tukum Perak.
23 Dec 11
Local Area

Sumatra (Indonesia)

Sumatra (Indonesian: Sumatera) is an island in western Indonesia, westernmost of the Sunda Islands.
The longest axis of the island runs approximately 1,790 km (1,110 mi) northwest-southeast, crossing the equator near the centre. At its widest point the island spans ...
7 Jan 12

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering about 20% of the Earth's water surface. It is bounded on the north by Asia (including the Indian subcontinent, after which it is named); on the west by Africa; on the east by Indochina, the Sunda Islands, ...
6 Apr 12

Tanjung Sinaboi to Singapore strait (E Sumatra)

The S coast of the Strait of Malacca between Tanjung Sinaboi and Tanjung Medang, the N point of Pulau Medang about 37 miles ESE, is fronted by numerous mudbanks, which are a continuation of South Sands. Some of these banks dry and are marked by occasional breakers.
Pulau Medang ...
25 Jan 12

Pulau Burung (Burung-E Sumatra)

Pulau Burung (Boeroeng), 4 miles NNW of the entrance of the Sungai Kateman, is low, wooded, and separated from the Sumatera coast by a narrow channel.  Pulau Burung is a drying bank extends from 1 to 2 miles from the ends of the island.
Kateman Island and Pulau Burung are ...
27 Feb 12

Pulau Garang and Pulau Galang Baru (Indonesia)

Pulau Galang and Pulau Galang Baru (Galang Baroe), S of it, both hilly and thickly wooded, are separated by Selat Penjabung. On the E side of these islands are numerous islands and reefs terminating E in Pulau Karas-besar.
11 Feb 12
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