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CORRECTIONS RADIO BEARINGS

Radiobeacon station..
Dead reckoning position of ship--

25 Latitude, 40°37' N.

39 50

Middle latitude, 40 14 Radio station..

Longitude, 69°37' W. Dead reckoning position of ship

67 35

Longitude difference, 2 02 Entering the table with difference of longitude equals 2°, which is the nearest tabulated value, and opposite 40° middle latitude, the correction of 39' is read.

The ship being east of the radiobeacon, the correction is minus. The Mercator bearing will then be 2990 – °39'=298°21'. To facilitate plotting, add 180° and plot from the position of the radiobeacon, the bearing (298°21' +180°) or 478°21' or 118°21' (Mercator bearing reckoned clockwise from north true).

Table of corrections, in minutes

(DIFFERENCE OF LONGITUDE IN DEGREES)

Mid. L.

4o| 1° 1}°| 2° 24°| 39 34°| 49 42°| 5° | 5°| 6° | 64°| 7 | 74°| 8 | 84°| 9° | 94°| 10°,

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RADIO PUBLICATIONS.—The international general radio regulations are published in the Report to the Secretary of State by the Chairman of the American Delegation to the International Radiotelegraph Conference, Madrid 1932 (also known as the International Telecommunication Convention). This publication is number 7 of the service documents described previously and is for sale by the Superintendent of Documents, Government Printing Office, Washington, D. C.

Extracts from the International Convention for the Safety of Life at Sea, London 1929 (affecting radio) may be obtained from the Federal Communications Commission, Washington, D. C.

The Communications Act of 1934 with amendments and index thereto, and revised to May 20, 1937, is for sale by the Superintendent of Documents, Government Printing Office, Washington, D. C. Price 10 cents.

Ship Radio Telegraph Safety Rules must be carried in the radio room under the present regulations of the Federal Communications Commission. This publication may be obtained from the Commission or from the Superintendent of Documents, Washington, D. C.

The International Bureau of the Telecommunication Union (Berne, Switzerland) publications give a complete description of radio communications throughout the world, including name of stations, call letters, geographic location, frequencies, types of emission, power, hours, nature of services, rates, and name of owners or operating agencies. Editions are issued in different languages, including English, which enable nations to adopt the Berne publications for their own local use. A list of the more important publications follows:

1. List of Frequencies, 8th Edition (February 1938), published once year with monthly supplement. Price 21 Swiss gold francs.

2. List of Coast Stations and Ship Stations, 10th Edition (March 1938), published every 6 months, no supplement. Price 4.00 Swiss gold francs.

3. List of Aircraft and Aeronautical Stations, 9th Edition (November 1937), published every 6 months, no supplement. Price 2.90 Swiss gold francs.

4. List of Broadcasting Stations, 7th Edition (June 1937), published whenever necessary. Supplement every 6 months. Price 4.25 Swiss gold francs.

5. List of Stations Performing Special Services, 6th Edition (July 1936), published whenever necessary. Supplement every 3 months. Price 5.50 Swiss gold francs.

6. List of Call Letters of Fixed Land and Mobile Stations, 7th Edition (August 1937) published once a year. Supplemented monthly. Price 7.00 Swiss gold francs.

7. List of Fixed Stations, 4th Edition (March 1937), published once a year, Supplemented monthly. Price 7.70 Swiss gold francs.

NOTE.—The above prices include postage and are subject to fluctuations. Remittances should be made by international money order to the International Bureau of Telecommunication Union, Berne, Switzerland.

Information in the various Berne publications, concerning radio stations under the jurisdiction of the United States Federal Communications Commission, is currently corrected by a radio service bulletin published twice a month by the Commission. Changes in the rules and regulations of the Commission are also contained in the bulletin. The substance of the previous bulletins is not repeated in each new issue. The Radio Service Bulletin may be obtained from the Federal Radio Communications Commission, Washington, D. C.

Radio Aids to Navigation, United States Hydrographic Office Publication (H. 0.205), (1938 edition in two volumes) contains com

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PUBLICATIONS

27 prehensive information regarding radio service of value to navigation throughout the world. It may be obtained from the Hydrographic Office, Washington, D. C., price $1.80. This publication is divided into chapters according to the nature of the service rendered by the radio stations. In each chapter the stations are arranged, in general, in geographical order so that the mariner may readily determine the stations available in his vicinity. In addition this publication includes: Instructions, regulations, and general information regarding radio time signals, radio direction-finder stations, radio beacon stations, radio weather bulletins, storm and navigational warnings, medical advice by radio, distress signals, codes, etc. Additions and changes to this publication are issued weekly in the Hydrographic Office Notice to Mariners and extracts affecting it will be mailed to those not in receipt of the Notice to Mariners on request to the Hydrographic Office, Washington, D. C.

The Hydrographic Bulletin, issued weekly by the Hydrographic Office, contains at frequent intervals a very convenient table arranged in chronological order showing the broadcasting schedule of the United States Naval radio stations transmitting time signals, weather information, storm and navigational warnings. This bulletin may be obtained from the Hydrographic Office, Navy Department, Washington, D. C., without charge.

International Code of Signals (American Edition) Vol. II.Radio, contains the international code whereby exchange of information in abbreviated form may be made between peoples speaking or not speaking the same language. This publication is for sale by the Hydrographic Office, Navy Department, Washington, D. C.

Radiobeacon charts issued by the United States Lighthouse Service show the radiobeacon stations with their characteristics and operating schedules. These charts may be obtained without charge from the offices of the District Lighthouse Superintendents.

The Light Lists issued by the United States Lighthouse Service contain information relating to radiobeacons and distance finding. A general description is given in the introduction, and the characteristics and operating schedules appear in the list.

Distribution of Weather Information by Radio (Radio Circular No. 1) is issued by the United States Weather Bureau.

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2. SAILING DIRECTIONS

For the convenience of the navigator, the courses and distances for the more frequently traveled routes in western Alaska are shown below in tabular form. The courses given are those usually followed by vessels navigating the locality, but the tables should be used judiciously and should be considered as supplementing the latest charts.

The continual current setting northward and westward along the coast of Alaska should be given special attention in following the courses along the coast. Remarks on these currents will be found under the headings: General Information, Alaska Peninsula, Aleutian Islands, and Bering Sea.

Sailing directions for bays, harbors, channels, etc., not shown in the following tables, will be found under the headings of the various features.

Distance table.—The table of distances shown on page 37 is a reprint from Distances Between United States Ports pubīished by the Coast and Geodetic Survey, price 10 cents.

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29

Course (true)

Distance

from Distance

Cape in nau

Spencer tical

in naumiles

tical miles

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328

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PRINCE WILLIAM SOUND

TABLE 2.-Cape Hinchinbrook to Cordova

CHARTS (8520-8525)

4a. To Porpoise Rocks abeam, distant 294 miles--5a. To abeam point 3 miles northward of Bear Cape.

Keep 1 mile or more offshore.6a. To Johnstone Point Light abeam, distant 194

miles. 7a. To Middle Ground Shoal lighted bell buoy

abeam, distant 72 mile. 8a. To Hanks Island Rock lighted bell buoy abeam,

distant 72 mile.. 9a. To buoy 3 abeam, distant 400 yards. 10a. To a position 72 mile 17° true from North Island.

Rock awash northeast from North Island is

usually marked by a stake. 11a. To a position 400 yards 95° true from lighted

buoy 2. Follow buoys to Cordova.--
12a. To buoy 4.---
13a. To a position off Ocean Dock, Cordova. Ex-

cept at slack water strong currents will be
experienced in Orca Inlet...

TABLE 3.-Cordova to Latouche

(CHARTS 8525-8551-8515)

14a. From off Ocean Dock to buoy 4.-
15a. To a position 400 yards 95° true from lighted

buoy 2---
16a. To a position 32 mile 37° true from North Is-

land.. 17a. To a position 400 yards off buoy 3.. 18a. To a position 142 miles 345o true from Seal

Island Light. Pass north of buoy 2.--.
19a. To Point Helen Light abeam, distant 1 mile..
20a. To Point Grace on port beam, distant 34 mile..
21a. To a point off the wharf at Latouche. For

continuation to Seward see table following
course No. 8....

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