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52

Sector 2. The Line Islands, the Cook Islands, the Samoa Islands, and the Tonga Islands

ported that a swell from the SW, raised by gales in high S lati- tudes, cause a heavy surf on the S coasts of the islands. Tides—Currents.—The currents in the shallower waters of

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this area and near the island coasts are greatly influenced by the winds and tend to follow the line of the coasts.

Caution.—A local magnetic anomaly has been reported to exist at position 20°42'S, 175°01'W.

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Generally, a line of shallow and shoal depths extends SSW

from the Tonga Islands for about 500 miles to the Kermadec Group, continuing SSW towards New Zealand. The Kermadec Group and the dangers SW of them are described in Pub. 127, Sailing Directions (Enroute) East Coast of Australia and New Zealand and may be seen on the appropriate chart.

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Volcanic activity has been reported (1979) in position

25°52'S, 176°14'W; in 1986 in position 24°58'S, 175°52'W; and, in 2006, in position 18°48'S, 174°38'W.

2.48 The Minerva Reefs (23°46'S., 179°02'W.), lying

from 250 to 275 miles SW of Tongatapu Group, appear to stand on a submarine plateau from 549 to 1,097m below the surface of the sea, which extends about 28 miles in a NNE and SSW direction. The two reefs are 18 miles apart and are locat- ed toward the extremities of the plateau.

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South Minerva Reef (23°56'S., 179°08'W.), consisting of

two united atolls about 4.8 miles long in an ENE and opposite direction, has large detached blocks of coral lying on the W reef, which dries 0.9m.

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A bight on the N side of the junction of the two atolls is

about 0.8 mile wide. Here, about 0.3 mile N of the reef, there are depths of 18 to 37m, where vessels can find protected anchorage during the SE trades. A tower stands close to the junction of the two reefs.

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North Minerva Reef (23°38'S., 178°55'W.), nearly circular

in shape, has a diameter of about 3 miles. The reef, which dries about 0.6m or 0.9m, was reported to give a good radar echo. An opening about 0.2 mile wide, and which has tidal currents running through it at rates of 3 knots, leads into the coral-free lagoon. Anchorage may be had, in a depth of 27m, sand, near the center of the lagoon.

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Pelorus Reef (22°51'S., 176°26'W.), about 144 miles NE of

North Minerva Reef, has a charted depth of 26m. It would be prudent to avoid the vicinity of this reef.

For the many shoal areas and reported discolored water areas S of the Tonga Islands refer to the chart.

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Ata (22°20'S., 176°12'W.), 32 miles NNE of Pelorus Reef, is

distinguished by two lofty peaks of about equal height, the N of which is about 290m high. The island, about 1.5 miles long, is wooded. A rock, about 91m high, lies close off the S point of the island, and some white rocks, 122m high, lie close off the NW point.

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Gleaner Reef (22°43'S., 173°54'W.), which was struck by a

vessel drawing about 5m, lies about 128 miles ESE of Ata, but the position is doubtful.

An obstruction was reported (1946) in position 21°54'S, 174°01'W, about 49 miles NNW of Gleaner Reef.

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Depths of 168m and less have been reported to lie between

Ata and Tongatapu, and may best be seen on the chart. Vessels are urged to use the appropriate caution in this area.

Eua Island (21°22'S., 174°56'W.), the farthest S of the Tonga Islands, lies about 10 miles SE of Tongatapu. The island

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Pub. 126

is 10.5 miles long in a N-S direction and nearly 4 miles wide; it rises to a height of 329m near its S end.

Kalau, an islet 37m high, lies 2.5 miles WSW of the of the S extremity of Eua.

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When approaching Tongatapu from the S, Eua provides a

good landfall; however, caution should be exercised if ap- proaching from this direction.

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English Road, on the NW side of Eua Island, affords anchor-

age, in 46m, about 0.3 mile offshore, off the village of Ohonua. This anchorage is unsafe in W winds.

2.49 Tongatapu (21°10'S., 175°12'W.), the principal

island of the Tonga group, is triangular in shape and is about 18 miles long, 9 miles wide, and mostly level. The ground is undulating in places and rises from sea level on the N coast to an elevation of about 61m in the SE part of the island. Caution.—Uncharted reefs have been reported to lie up to 4 miles off the island’s S side.

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Attention is drawn to the presence of old mine zones around Tongatapu.

Niu Aunofo (21°04'S., 175°20'W.), the NW extremity of Tongatapu, is a low, wooded rocky cliff.

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Duff Reef, 2.5 miles W of the light on Niu Aunofo, is a small steep-to reef on which the sea always breaks heavily.

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The coast for 2.5 miles SW of Niu Aunofo is rocky, with

long white patches of sand, and is fringed by a narrow reef which is steep-to.

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For 12 miles SE, there is a considerable number of blow-

holes which extend between the higher ground and the coast- line. The coast is mostly low rocky cliffs, with patches of white sand in places.

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From this point to Houma Toloa (Homa Toloa), the S ex-

tremity of the island, the coast changes and rises until at that point the cliffs of coral rock are more than 61m high. A barrier reef, or series of reefs, extend along the entire S side of the island, 3 to 4 miles S from it.

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From Houma Toloa to Mui Hopohoponga (21°09'S.,

175°02'W.), the E extremity of the island, about 9 miles NNE, the coast consists of low, broken rocky cliffs and sand patches. The fringing reef which surrounds Houma Toloa continues

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for some distance to the N. A similar reef extends around Mui Hopohoponga.

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From Mui Hopohoponga the coast trends 16.5 miles WNW

to Niu Aunofo. It is broken and low, the highest point being Popua, a hill with an elevation of 33m to the tops of the trees, located on the coast 7.5 miles W of Mui Hopohoponga. Coral reefs extend 9 miles offshore, and other dangers lie

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within 13 miles of the coast; there are some islets on these reefs in the approaches to Nuku’alofa.

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Eua Iki lies about 3 miles ENE of Mui Hopohoponga. Reefs,

which break, extend about 0.8 mile in a SSE direction from the island; no vessel should attempt to pass the E or S sides nearer than 1.5 miles.

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ways breaks.

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The extensive reef 3 miles NNE of Mui Hopohoponga al- There are three channels leading to Nuku’alofa, from E to

W, are Piha Passage, Ava Lahi, and Egeria Channel. Piha Passage can ordinarily be used in an emergency, but is not re- commended. Egeria Channel is not recommended. Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112  |  Page 113  |  Page 114  |  Page 115  |  Page 116  |  Page 117  |  Page 118  |  Page 119  |  Page 120  |  Page 121  |  Page 122  |  Page 123  |  Page 124  |  Page 125  |  Page 126  |  Page 127  |  Page 128  |  Page 129  |  Page 130  |  Page 131  |  Page 132  |  Page 133  |  Page 134  |  Page 135  |  Page 136  |  Page 137  |  Page 138  |  Page 139  |  Page 140  |  Page 141  |  Page 142  |  Page 143  |  Page 144  |  Page 145  |  Page 146  |  Page 147  |  Page 148  |  Page 149  |  Page 150  |  Page 151  |  Page 152  |  Page 153  |  Page 154  |  Page 155  |  Page 156  |  Page 157  |  Page 158  |  Page 159  |  Page 160  |  Page 161  |  Page 162  |  Page 163  |  Page 164  |  Page 165  |  Page 166  |  Page 167  |  Page 168  |  Page 169  |  Page 170  |  Page 171  |  Page 172  |  Page 173  |  Page 174  |  Page 175  |  Page 176  |  Page 177  |  Page 178  |  Page 179  |  Page 180  |  Page 181  |  Page 182  |  Page 183  |  Page 184  |  Page 185  |  Page 186  |  Page 187  |  Page 188  |  Page 189  |  Page 190  |  Page 191  |  Page 192  |  Page 193  |  Page 194  |  Page 195  |  Page 196  |  Page 197  |  Page 198  |  Page 199  |  Page 200  |  Page 201  |  Page 202  |  Page 203  |  Page 204  |  Page 205  |  Page 206  |  Page 207  |  Page 208  |  Page 209  |  Page 210  |  Page 211  |  Page 212  |  Page 213  |  Page 214  |  Page 215  |  Page 216  |  Page 217  |  Page 218  |  Page 219  |  Page 220  |  Page 221  |  Page 222  |  Page 223  |  Page 224  |  Page 225  |  Page 226  |  Page 227  |  Page 228  |  Page 229  |  Page 230  |  Page 231  |  Page 232  |  Page 233  |  Page 234  |  Page 235  |  Page 236  |  Page 237  |  Page 238  |  Page 239  |  Page 240  |  Page 241  |  Page 242  |  Page 243  |  Page 244  |  Page 245  |  Page 246  |  Page 247  |  Page 248  |  Page 249  |  Page 250  |  Page 251  |  Page 252  |  Page 253  |  Page 254  |  Page 255  |  Page 256  |  Page 257  |  Page 258  |  Page 259  |  Page 260  |  Page 261  |  Page 262  |  Page 263  |  Page 264  |  Page 265  |  Page 266  |  Page 267  |  Page 268  |  Page 269  |  Page 270  |  Page 271  |  Page 272  |  Page 273  |  Page 274  |  Page 275  |  Page 276  |  Page 277  |  Page 278  |  Page 279  |  Page 280  |  Page 281  |  Page 282  |  Page 283  |  Page 284  |  Page 285  |  Page 286  |  Page 287  |  Page 288  |  Page 289  |  Page 290  |  Page 291  |  Page 292  |  Page 293  |  Page 294  |  Page 295  |  Page 296  |  Page 297  |  Page 298  |  Page 299  |  Page 300  |  Page 301  |  Page 302  |  Page 303  |  Page 304  |  Page 305  |  Page 306  |  Page 307  |  Page 308  |  Page 309  |  Page 310
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