Ian Waugh - A Mariner\'s Guide to Marine Communications

countries, the voice/telex broadcasts may be made in the absence of

NAVTEX/SafetyNET information and may be your only source of

detailed coastal information.

Vessels trading in waters which have adequate MSI broadcasts

using HF NBDP may be exempt from carrying Inmarsat SafetyNET

using their HF SSB Radio, with NBDP, instead. To find the VHF /SSB

stations broadcasting MSI using voice/NBDP (Narrow Band Direct

Printing) for radio stations in any particular country, you can:

• Open ALRS Volume 3 to the 'Index of Geographical Sections'
  Find the country you require and turn to the pages for that country.
  Identify which stations are operating; their broadcast channels/
  frequencies, and broadcast times for Nav/Weather information.
  Use the 'Weather Forecast Area (W) Diagrams' and 'NaVigation
  Warning (N) Diagrams' to identify the 'forecast/navigation warning
  areas' referred to in their messages.

Example 1 - South Africa

Shows Cape Town Radio, Port Elizabeth and Durban Radio broadcast

times and frequencies for Storm Warnings, Weather Forecasts and

Navigational Warnings on NAVTEX; HF Voice/NBDP; and VHF

Radio. (The example shows an extract of the Cape Town frequencieslchannels)

Cape Town (ZSC) [C)

Diagrams (W211W22 page

B

C

C

D

D

E Alexander Bay

E Port Nolloth

NI page

518

4214

8431.5

4435

8800

Ch24

ChOl

X3 page

FIB

FIB

FIB

J3E

J3E

Storm Warnings

B-E: On receipt and at the next scheduled time.

Weather Messages

(position lat/long)

(position latllong)

B: 1220, 1620 Gale warnings/Weather forecast for Areas 3, 4, lIon diagram

W22.

C: 0930, 1730 Gale warnings/Weather forecast for Areas 1-6, 8-17 on diagram

W22.

D, E: 1015, 1333, 1815.

Navigational Warnings

B-E: On receipt and at the next scheduled time, i.e;

B: 0020, 0420, 0820, 1220, 1620, 2020.

20 THE NAUTICAL INSTITUTE