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MERCHANT SHIPPING (RADIO DIRECTION-FINDERS) RULES, 1974

(LI 950).

IN exercise of the powers conferred by section 181 of the Merchant Shipping Act, 1963 (Act 183) on the Commissioner responsible for shipping these Rules are made this 7th day of June, 1974.

Rule 1—Application of the Rules.

These Rules shall apply to:

(a) Sea-going Ghanaian ships of sixteen hundred tons gross or upwards;

(b) Sea-going ships, other than Ghanaian ships of sixteen hundred tons gross or upwards while they are within any port in Ghana;

Provided that these Rules shall not apply to:

(i) pleasure yachts,

(ii) fishing vessels,

(iii) any other ship not engaged on an international voyage.

Rule 2—Radio Direction Finders.

Every ship to which these Rules apply shall be provided with a radio direction-finder complying with the requirements specified in the First Schedule.

Rule 3—Climatic and Durability Tests.

(1) The radio direction-finder required by these Rules shall be such that it will be free from mechanical defects and will comply with the requirement of these Rules:

(a) while undergoing the vibration, dry heat and low temperature tests specified in the Second Schedule;

(b) when subjected to the damp heat tests specified in paragraph 2 of the Second Schedule; and

(c) immediately after undergoing the other tests required by the Second Schedule.

(2) The radio direction-finder aerial system referred to in the First Schedule shall be such that after undergoing the mould growth tests required by the Second Schedule, no mould growth will be present on it.

Rule 4—Interference with Reception.

(1) At no time when a ship is at sea shall interference or mechanical noise produced by a radio direction-finder required by these Rules or by other equipment in the ship be of such intensity as to prevent the efficient determination of radio bearings by means of the radio direction-finder.

Communal Aerial System.

(2) Any ship which is provided with a radio direction-finder not being an existing installation shall also be provided with a communal aerial system for all broadcast receivers in respect of which it is impracticable to erect efficient aerials which—

(a) are outside a radius of 50 feet from the direction-finder; or

(b) can be lowered quickly and stowed easily when the direction-finder is in use.

Rule 5—High Voltage Parts.

(1) All parts and wiring of the equipment specified in these Rules in which the direct and alternating voltage (other than radio frequency voltages) combine at any time to give an instantaneous voltage greater than 50 volts shall be protected from accidental access.

(2) All parts and wiring of the equipment specified in these Rules (other than the parts and wiring of a rotating machine) in which the direct and alternating voltages (other than radio frequency voltages) combine at any time to give an instantaneous voltage greater than 250 volts shall be isolated automatically from all sources of electrical energy when the means of protection are removed.

Rule 6—Supply of Electrical Energy.

There shall be available in every ship to which these Rules apply while she is at sea and at all reasonable times when she is in port, a supply of electrical energy sufficient for the operation of the radio direction-finder in accordance with these Rules for testing purposes and for the charging of any batteries which are a source of electrical energy for the radio direction-finder.

Rule 7—Charging of Batteries.

(1) (a) If batteries are provided as a source of electrical energy for the radio direction-finder, means shall be provided on every ship for the charging of such batteries from the ships main source of electrical energy.

(b) The master of the ship shall cause such batteries to be tested once a day by voltmeter and once a month by hydrometer and shall cause any battery which is found not to be fully charged to be brought to a fully charged condition as soon as possible.

Record on Charged Batteries.

2.         (a) The master of  every such ship shall maintain or cause to be maintained separate records and whenever any batteries providing source of electrical energy for the radio direction-finder are charged, or when such batteries are tested as required by subrule (1) (b) appropriate entries shall be made in the said records.

(b) The said record shall be kept with the record of calibration maintained under rule 12 and shall be made available for any inspection by a radio surveyor.

Rule 8—Installation of Radio Direction-finder.

(1) The direction-finder shall be installed in such a position that efficient determination of radio bearings by means of the instrument will not be hindered by extraneous noises.

(2)       (a) The direction-finder aerial system referred to in the First Schedule shall be mounted in such a manner that the efficient determination of radio bearings by means of the instrument is hindered as little as possible by the proximity of aerials, derricks, wire halyards or other metal objects.

(b) Unless the feeder cables connecting the direction-finder aerial system with the receiver forming part of the direction-finder consist of solid di-electric screened cable, they shall be protected by metal tubes which are bounded to earth. The joints of the feeder cables shall be watertight.

Rule 9—Means of Communication.

In every ship to which these Rules apply there shall be provided—

(i) an efficient two-way means of calling and voice communications between the direction-finder receiver and the bridge; and

(ii) an efficient means of signalling between the direction-finder receiver and the ship's standard compass or gyro-compass repeater, if any.

Rule 10—Restrictions on Use of Direction-Finder.

The radio direction-finder shall not be used—

(a) for any purpose other than the business of the ship; or

(b) for keeping the radio watch required by the Radio Rules.

Rule 11—Calibration.

(1) The master of every ship to which these Rules apply shall cause the radio direction-finder to be calibrated in accordance with this rule as soon as practicable after it has been installed in the ship and whenever any change is made in the position of the direction-finder aerial system.

(2)       (a) The direction-finder shall be calibrated by two persons, one of them being experienced in taking radio bearings and the other experienced in taking visual bearings;

(b) The calibration shall be carried out by taking simultaneous radio and visual bearings of a calibrating transmitter, and such bearings shall be taken at intervals of not greater than 5 degrees throughout 360 degrees on a frequency between 285 kc/s and 315 kc/s.

(3) Calibration tables and curves shall be prepared on the basis of the bearings taken in accordance with sub-rule (2).

Verification of Calibration.

(4) The calibration tables and curves prepared in accordance with the foregoing provisions of this rule shall be verified—

(a) at intervals not exceeding twelve months; and

(b) whenever any change is made in any structure or fitting on deck which is likely to affect the accuracy of the radio direction-finder.

If such verification shows that the calibration tables or curves are materially inaccurate, the master of the ship shall cause the radio direction-finder to be recalibrated as soon as practicable in the manner specified in sub-rules (2) and (3).

Rule 12—Records.

The following records shall be kept on board in a place readily accessible to any person operating the direction-finder and to be readily available for inspection by a radio surveyor, namely,

(a) a list or diagram indicating the condition and position on the most recent occasion on which the direction, finder was calibrated, of—

(i) the aerials, and

(ii) all movable structures on board the ship which might affect the accuracy of the direction-finder;

(b) the calibration tables and curves which were prepared on the last occasion on which the direction-finder was calibrated;

(c) a certificate of calibration, in the form specified in the Third Schedule relating to the calibration carried out on the most recent occasion and signed by the persons making the calibration; and

(d) a record, in the form specified in the Fourth Schedule of check-bearings taken for the verification of calibration, the bearings being numbered in the order in which they were taken.

Rule 13—Wiring Diagrams and Instructions.

A schematic wiring diagram of the direction-finder and a book containing adequate instructions as to the use of the direction-finder shall be available at all times for the use by any person operating or testing the direction-finder.

Rule 14—Exemptions.

Notwithstanding anything contained in these Rules, the Commissioner may, by order in writing and subject to such conditions and restrictions as may be specified therein, exempt any ship under 5,000 tons gross from the application of these Rules if he is satisfied that, having regard to the area or areas in which the ship is engaged on a voyage or voyages, the carriage on board of radio direction-finder is unnecessary.

Rule 15—Interpretation.

In these Rules—

"Act" means the Merchant Shipping Act, 1963 (Act 183);

"existing installation" means an installation wholly installed on board a ship before 26th May, 1965; or an installation, part of which was installed on board a ship before the 26th May, 1965 and the rest of which consists either of parts installed in replacement of identical part or parts which comply with the requirements of these Rules;

"interference" means any radiation or any induction which endangers the functioning of a radio navigation service or obstructs or repeatedly interrupts radio service operating in accordance with these Rules;

"radio surveyor" means a person appointed as such under section 315 (3) of the Act;

"Schedule " means a Schedule to these Rules;

In relation to classes of emission—

"Class Al " means telegraphy by on-off keying without the use of a modulating audio frequency;

"Class A2" means telegraphy by the on-off keying of an amplitude modulating audio frequency or audio frequencies, or by the on-off keying of  the modulated emission;

"Class B " means damped waves.

SCHEDULES

FIRST SCHEDULE

DIRECTION-FINDER

1. General.—The direction-finder shall include a receiver and a direction-finder aerial system. The mechanical parts of the direction-finder aerial system, other than ball bearings, hose clips, set screws and other similar small parts, shall consist of non-magnetic material.

2. Frequency ranges and Classes of Emission.—The receiver shall be capable of receiving Class A1, Class A2 and Class B emissions of any frequency within the range of 255 kc/s to 525 kc/s.

3. Sensitivity.—In the absence of interference, the direction-finder shall have sufficient sensitivity to permit accurate bearings being taken on a signal having a field strength as low as 50 microvolts per metre.

4. Accuracy of bearings—When the direction-finder is tested and after due allowance has been made for any site errors, the bearing as indicated by the scale of the direction-finder shall be within one degree of the correct bearing.

This requirement shall be met at all frequencies in the range of frequencies specified in paragraph 2 of this Schedule and throughout the whole 360 degrees of azimuth regardless of the previous setting of the bearing indicator.

5. Radiation.—The receiver when in use shall not produce a field exceeding 0. 1 microvolt per metre at a distance of one mile from the receiver.

 

 

SECOND SCHEDULE

CLIMATIC AND DURABILITY TESTS

In this Schedule—

(i) references to Class B equipment shall be construed as references to each part of the direction-finder other than the direction-finder aerial system;

(ii) references to Class X equipment shall be construed as references to the direction-finder aerial system.

2. Class B and Class X equipment shall be subjected to tests conducted in the order in which they appear in the following Tables:—

 

TABLE

 

Nature of  Test           Classes of Equipment to which the test shall be applied            

Visual Inspection and Performance Test

Inspection under vibration         . .      . .

Bump Test . .      . .        . .        . .      . .

Dry Heat Cycle   . .        . .        . .      . .

Damp Heat Cycle. .        . .        . .      . .

Low Temperature Cycle . .        . .      . .

Rain Test   . .      . .        . .        . .      . .

Immersion Test   . .        . .        . .      . .

Corrosion Test    . .        . .        . .      . .

Mould Growth Test         . .        . .      . .

Visual Inspection and Performance Test   B and X

B and X

B and X

B and X

B and X

B and X

 X

X

B and X

X

B and X         

3. The Tests referred to in paragraph 2 of this Schedule shall be conducted strictly in the manner described in the Performance Specification for the Climatic and Durability Testing of Marine Radio Equipment issued by the Post Master General in the United Kingdom or any other approved Specification.

 

THIRD SCHEDULE

CERTIFICATE OF CALIBRATION OF DIRECTION-FINDER

1. We, the undersigned, hereby certify that we have this day—

(a) calibrated, in accordance with the Merchant Shipping (Radio Direction-Finders) Rules, 1974, the direction-finder installed on the s.s./m.v. .............................;

(b) handed to the Master of the aforesaid ship, tables of calibration corrections: and adjusted the radio direction-finder so that the readings taken thereby, when corrected with such tables, differed from the correct bearings by no more than plus or minus two degrees.

2. We hereby further certify that the Master of the said ship has been furnished with a list/diagram indicating the condition and positions, at the time of such calibration, of the aerials and all moveable structures on board the ship which might affect the accuracy of the direction-finder.

.......................................................... Radio Observer

..........................................................Visual Observer

.............................................................................Date

............................................................................Place

 

FOURTH SCHEDULE

RECORDS OF CHECK BEARINGS TAKEN BY MEANS OF THE DIRECTION-FINDER

 

            (1) Serial Number of Bearings       

            (2) Date         

            (3) Time (G.M.T.)      

            (4) Latitude   

            (5) Longitude

            (6) Distance from Transmitter         

            (7) Direction-Finder Bearing of (Name)    

            (8) Direction-Finder Relative Bearing corrected for Q.E.

            (9) Ships Head by Compass 0/360º          

            (10) Total Compass Error   

            (11) 1/2 Convergency Applied       

            (12) Ships Head Corrected (True) 

            (13) True Bearing by Direction-Finder col. (8) and col. (12).      

(14) True Bearing by Visual Check or Calculation (whether Visual or Calculation

to be indicated; if by Calculation, the method to be stated).       

(15) Correction required to make col. (13) equal col. (14) (indicating whether-or

+).       

            (16) Signature of Observer or Observers. 

 

COLONEL P. K. AGYEKUM

Commissioner Responsible for Shipping

 

Date of Gazette Notification: 12th July, 1974.

 

 

 

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