On the same date a first-class compressed-air fog-siren,
which will sound 3 blasts every minute thus, blast 2 seconds,
silent interval 16 seconds; blast 2 seconds, silent interval 16
seconds; blast 4 seconds, silent interval 20 seconds will be
established at the station.

Approx. position: Lat. 33° 42' 31" N., long. 118° 15' 3" W.

URUGUAY.

PLATA RIVER.—ENGLISH BANK.—LIGHTHOUSE BUILDING.
—Information has been received that a lighthouse is being
erected on English Bank, Plata River, Uruguay.

MONTEVIDEO.—TIME-SIGNAL ESTABLISHED.—The German
Government has given notice that a time-ball dropped at
0 h. 0 m. 0 s. local mean time, corresponding to 3 h. 44 m. 51·4 s.
Greenwich mean time, has been established on the western
corner of the observatory at Montevideo, Uruguay.
The ball, painted red, with one yellow horizontal band, is
about 3 ft. in diameter, and has a drop of 10 ft.
The international code flag H is hoisted on the signal-mast
of the observatory 10 minutes before and the ball is hoisted
5 minutes before the signal is made. If the signal is correct,
the flag will be lowered, but, if not, it will remain hoisted
and the signal will be repeated at 1 h. 0 m. 0 s. local mean
time.

Approx. position: Lat. 34° 54' 33" N., long. 56° 12' 45" W.

Monte Video Bay.—Alterations in Buoyage.—Wrecks removed.

Position.—East breakwater lighthouse, lat. 34° 55' S.,
long. 56° 13½' W.

1. Alteration in lights shown from light-buoys:
   Bearing and distance from East Breakwater Lighthouse—
   (a.) 356° (N. 8° W. mag.), 3½ cables.
   (b.) 32° (N. 28° E. mag.), 4·6 cables.
   (c.) 35° (N. 31° E. mag.), 6·4 cables.

Alteration—
The lights are now red flashing.

2. Buoy withdrawn:

Position.—At a distance of 3¾ cables, 38° (N. 34° E.
mag.), from the East Breakwater Lighthouse.
Description.—A conical light-buoy exhibiting fixed red light.

3. Buoy established:

Position.—At a distance of about one cable, south-
ward, from Low Rocks, and 1⅓ cables, 100°
(S. 84° E. mag.), from Punta del Rodeo.
Description.—A black can buoy.

4. Amended position of Piedras Blancas light-buoy:

Position.—At a distance of 2·7 cables, 335° (N. 29°
W. mag.), from position now shown on the charts,
and 6½ cables, 201° (S. 17° W. mag.), from the
flagstaff at entrance to Cibil Dock.

Description.—A light-buoy, painted black, exhibiting a flashing white light.
Note.—“Position approximate” shown against this buoy on the charts has been erased.

5. Wrecks removed:

Bearing and distance from East Breakwater Lighthouse—
(a.) 139° (S. 45° E. mag.), 4½ cables.
(b.) 245° (S. 61° W. mag.), 10·3 cables.

Remarks.—The two black buoys formerly marking wreck (b) have been withdrawn.

Variation.—4° E.

Chart affected.—No. 2001, Monte Video Bay.
Publication.—“South American Pilot,” Part I, 1911, page 381.

Monte Video.—Time-signal established.

Position.—On western tower of Observatory Buildings,
Punta San José. Lat. 34° 54' 33" S., long. 56° 12' 45" W.

Details.—A red ball with gilt band is dropped at noon,
Monte Video mean time, corresponding to 3 h. 44 m. 51·4 s.
Greenwich mean time.

Remarks.—A white and red flag, letter H of international
code, is hoisted on the semaphore tower of the institute
10 minutes before the time of the signal. Should the signal
fail or be incorrect, the flag will remain hoisted, and the ball
will be dropped at 1 h. 0 m. 0 s. p.m. If the signal is correct,
the flag will be hauled down at once.

Chart affected.—No. 2001, Monte Video Bay.

Publications.—“List of Lights and Time-signals,” Part VII,
1912, page 145. “South American Pilot,” Part I, 1910,
page 386.

GENERAL NOTICES.

Radio-telegraphic Practice between H.M. Ships and Merchant Ships.

The Board of Trade have been requested by the Lords
Commissioners of the Admiralty to direct the attention

of masters and owners of British merchant vessels to the
necessity for arranging for periodical practices in wireless
tel. communications between H.M. ships of war and ships
of the mercantile marine for the purpose of ensuring efficient
and reliable communication when required. It is therefore
hoped that all British shipowners and masters whose ships
are fitted with wireless tel. will co-operate to give effect to
the following proposals: It is pointed out that the exercises
must always be subject to the exigencies of H.M. service,
and these practices should only be carried out when they
will not interfere with commercial or naval work. (l.) At
8.30 a.m. and 2.30 p.m. daily any single man-of-war (de-
stroyers and small craft excluded) or one man-of-war in a
fleet in company, detailed by the senior naval officer present,
will adjust her wireless tel. transmitting and receiving ap-
paratus to the commercial 600-metre wave length and make
the call “ CCCC,” followed by her own commercial call sign,
indic. that she is prepared to carry out an exercise with any
British merchant ship within range. On a British merchant
ship receiving this call she will answer and say whether or
not she is prepared to proceed with the exercise. Should
more than one merchant ship answer, the man-of-war will
indicate which is to exercise and which is to wait. The ex-
ercise will then proceed, but no messages are to be exchanged
which are not authorized by the respective captains and
masters of the ships practising. No message received during
such exercises is to be forwarded beyond the ship actually
receiving the message, and no payment for any message can
be made. The exercises are to be considered as strictly on
service and not for any commercial advantage. (2.) In all
such exercises the man-of-war is to be considered the con-
trolling ship. (3.) The exercises will cease at 9.15 a.m. and
3.15 p.m. respectively, or before at the discretion of the
captains concerned. (4.) These exercises are only to be carried
out between vessels neither of which are within 150 miles
range of any commercial shore station using the 600-metre
wave length, and are to cease at once should one of H.M.
ships so direct. Nov. 1912.

RED SEA.

STRAITS OF BAB-EL-MANDEB.—TRACKS RECOMMENDED.—
Balfe Pt. lt. having been recently improved, vessels are
recommended to make use of the large strait (12° 35' N.,
43° 20' E.) in preference to the small one, in which latter
strait numerous casualties have occurred of late years. Tracks
usually followed have been altered on Chart No. 143 : (a.)
From a pt. 1½ miles 298° (N. 60° W. mag.) from Quoin Isl., in
a line 159° (S. 19° E. mag.) to a pt. 2 miles abreast of Balfe Pt.
lt. (b.) The line of the track passing to the S. of the S.W.
Haycock Isl. has been extended to meet track (a). (c.) All
other tracks through the large and small straits have been
expunged. Nov.

EASTERN ARCHIPELAGO, ETC.

BERHALA ISL.—A fl. white lt. every 15 secs.—fl. 3 secs.,
ecl. 12 secs.—vis. from 237° (S. 56° W. mag.), through W.,
N., and E., to 147° (S. 34° E. mag.); obsc. elsewhere; elev.
88 ft., R. 14 miles, is exh. from a white frame lt.-h., in 0° 52½'
S., 104° 24½' E., on the S.-wly.-most islet, srd. of Berhala
Isl. Nov.

SUMBAWA.—SAPEH STRAIT.—KELAPA ISL.—A fl. white lt.
every 5 secs.—fl. 1 sec., ecl. 4 secs.—elev. 512 ft., R. 30 miles,
is exh. from a white frame lt.-h. 49 ft. high, in 8° 40' S., 119°
14' E., on summit (423 as shown on chart) of isl. 2. A front
lt., F. white, elev. 446 ft., R. 28 miles, is exh. from a white
frame lt.-h. 13 ft. high, 794yds. 352° (N. 10° W. mag.) from
the above fl. lt. These lts. in line, 172° (S. 10° E. mag.),
lead through the chan. between Mata Gateh and Barsu Panda
Ists. Nov.

SOUTH AMERICA.

RIO DE LA PLATA.—INDIO PT. CHAN.—A pilot-hulk,
3-masted fore-and-aft schr., hull black, marked “ Almirante
Baraza ” on bow and stern, and “ Estacionario de Practicos ”
in large letters on sides, is est. in 35° 10' S., 56° 25' W., 1 mile
67° (N. 63° E. mag.) from Recalada Lt.-v. This hulk is a
station for Rio de la Plata pilots, and the word “ pilots ” has
been erased from the Recalada Lt.-v. Nov.

Notice to Mariners No. 9 of 1913.

SIGNALS FOR NAPIER INNER HARBOUR.

Marine Department,
Wellington, N.Z., 11th January, 1913.

THE Napier Harbour Board have notified that on and
after Monday, 20th January, 1913, the following signals
will be used for vessels working the inner harbour, viz.:—