Distress signals

Procedure Misuse of Radio Distress Signals

Cases have occurred in which the radio distress signal has been sent out by ships which were not at the time in immediate danger.

The attention of Masters is specially drawn to the urgency sig- nal ( ) which is provided for use in cases in which the ship making the call has an urgent message to transmit concerning the safety of the ship or of some person on board, but which does not necessarily imply that the ship is in imminent dan­ger or requires immediate assistance. The call has priority over all other communications except distress calls and it should be used in all cases in which the sending out of the SOS signal is not fully justified.

The SOS SIGNAL MUST BE USED ONLY WHEN THE SHIP IS IN IMMEDIATE DANGER AND URGENTLY IN NEED OF HELP. In other cases in which assistance is required use should be made of the urgency signal referred to above.

The Master of the vessel which has sent out a distress call, must if he decides subsequently that assistance is unnecessary, advise immediately all radio stations (both ship and shore) within range of his ship.

Alphabetical index of coast radio stations

Note. — In the various volumes of this publication, each station has been alloted a number for the purpose of identifying readily the different services carried out. The system of indexing is as follows: —

Nos. 1 to 999 refer to Coast Radio Stations. " 1001 to 1999 refer to Direction Finding Stations (See. Vol. II)

" 2001 to 2999 refer to Radiobeacons (See Vol. II) " 3001 to 3999 refer to Radio Time Signals (See Vol. II).

" 4001 to 4999 refer to Radio Weather Bulletins and

Storm Warnings (See Vol. III). " 5001 to 5999 refer to Radio Navigational Warnings

(See Vol. II).

II

Navigational aids

DIRECTION FINDING STATIONS, RADIOBEACONS, POSITION FIXING

Systems, etc.

Contents

Preface

General Information Abbreviations Call Signs

International Groups Radio Stations

Radiobeacons, "QTG" Services Aircraft Aids useful to Shipping Radar Stations

Loran, Consol, and Decca Systems Radio Time Signals Uniform Time System, etc.

and

List of Identification Signals

Arranged Alphabetically

Note. — In addition to the letters or groups of letters listed below (transmitted in Morse), a few radiobeacons transmit groups of dots or dashes with intervals of varying duration.

Identification Signal	Radiobeacon	Identification Signal	Radiobeacon
A	Ailly, Lt. Ho.	BN	Byelkin Pt. Lt. Ho.
	Amphitrite Pt. Lt. Ho.		Ко To Lt. Ho
	Grillon, C. Lt. Ho.		Svenska Bjorn Lt. V.
	Lutcher Lt. V.
A	Bald Head (C. Fear).	BR	Bar Lt. V. Cal. Stn.
	Batumi Lt. Ho.		Mara To Lt. Ho.
	Belle Isle N. E. Lt. Ho.	BS	Breaktea Lt. V. Cal. Stn.