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ON PASSAGE - ROUTINE COMMUNCATIONS

 

1. Selecting Correct VHF channel for local shore authorities.

 

 i)  Know your correct location.

ii)  See the back of each part of ALRS Volume - 6, so as the know the correct part of the

     ALRS volume 6.

iii) After selecting the correct part, refer the volume for the country in which you are. The  

     order of countries in the volume will be in the alphabetical wise.

iv) After finding your country, refer to the port in which you are. The port details will be

     under your country's section.

v)  Select Appropriate Channel/ Frequency for that particular port.

 

Note - 1) Refering to the correct part of the ALRS Volume - 6 is very important.

2. Adjusting transmitter power output on VHF

 

 

 

We adjust transmitter power output depending upon the range of communication so as to minimise the interference caused by/ caused to other stations.

 

For Greater distance we use HIGH Power

.

For Smaller distance we use LOW Power.

 

 

Note - For onboard communication we preferably use LOW Power.

Vhf 1 (232x640)

3. Setting Volume and Squelch

vhf 2 (232x640)

4. Adjusting Dimmer/ Contrast Control on VHF

 

 

 

 

 

 

We will use Dimmer/ Contrast Control when the intensity of the light of the VHF display is distracting us in Navigation.

 

 

 

Note - It is not necessay thay we use dimmer/ contrast control during night time only.

vhf 3 (232x640)

5. Demonstration of Dual Watch

 

 

 

Dual watch means keeping watch on 2 channels simultaneously. 

 

We preferably keep dual watch on Pilot's Channel/ Port Control AND CHANNEL 16.

 

 

i)  Enter the channel with whom you want to keep Dual Watch. (Except Ch 16)

ii) Press Scan to enter Dual Watch Mode/ to remove Dual Watch Mode.

 

 

 

Note - While keeping Dual Watch One Channel has to be 16.

 

 

 

vhf 4 (232x640) vhf 5 (232x640)

6. Selecting International Distress Channel on VHF R/T

Home > GMDSS > GMDSS FAQs > On Passage Routine Communications

7. Making Routine Ship to Ship Call using VHF or MF DSC.

 

i)    Refer to International Telecommunication Union (ITU) List 5 (List of ship stations to find the MMSI number of the given

     ship's name. (Note - Ship Names are arranged in alphabetical order)

ii)   Select "Main Menu" in VHF/MF DSC controller.

iii)  Select "TX-CALL".

iv)  Select "Individual".

v)   Enter the MMSI number of the ship to call.

vi)  State appropriate R/T frequencies (2048 KHz for MF/ Ch. 06 for VHF).

vii) Press "Call".

8. Adjusting Power Output of MF/HF Transmitter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max Power (HF) - 1500 Watts

Max Power (MF) - 400 Watts

Medium Power (MF) - 200 Watts

Low Power (MF) - 100 Watts

 

We use different transmitter power output depending upon the distance between us and the target station.

Larger the distance, Higher the power output used.

MFHF Transceiver 1

9. Selecting Correct HF R/T ITU Channel with a given coast station for a given position and time

 

i)  Know the correct location of the given Coast Station.

ii)  See the back of each part of ALRS Volume - 1, so as the know the correct part of the ALRS volume 1.

iii) After selecting the correct part, refer the volume's index for the country in which the Coast Station is. The order of countries in

     the volume will be in the alphabetical wise.

iv) After finding the country, refer to the port in which the station is. The port details will be under your country's section.

v)  Swith over to the given page as found in the index.

vi) Select Appropriate HF Frequency for that particular station depending upon the LMT and the availability of the frequency at the  

     given time for that station.

Frequency Band in MHz

Distance Covered Daylight Coverage

(Nautical Miles)

Distance Covered

Night Coverage

(Nautical Miles)

4

About 400

About 600

6

About 600

800 - 1200

8

800 - 1000

1200 - 1600

12

1000 - 1200

1600 - 2000

16

1200 - 2000

2000 - 2500

22

2000 - 2500

NIL

10. Adjusting MF/ HF Transreceiver for Reception of Live Signal.

 

i)   Press RX.

ii)  Enter frequency.

iii) Apply Tune Rate to listen the frequency clearly.

iv) If signal starts fading use Automatic Gain Control (AGC) for proper reception of the frequency.

v)  Use Sensitivity Control or R/X Gain Control for proper reception of the frequency.

vi) Adjust Volume as required.

11. Sending Routine text message to a given destination on INMARSAT-C.

 

i)   Prepare message in File Menu.

ii)  Go to Transmit Menu.

iii) Select Routine Priority.

iv) Select Telex Number from address book.

v)  Select CES of the country.

vi) SEND.

 

Note - We can choose any CES while sending Routine message only.