NDB Phare de Gatteville *FG :

 

no recordings available

 

a friendly letter, and a fine picture postcard, verify the reception on 291.9 kHz by Rudy van Dalen, and give an example of former navigational NDBs (1989)




The above letter shows a copy from a navigational handbook, listing an example of the system of maritime navigation used those days. There are 6 NDB's chained on the same frequency, and within a 6-minute sequence, each of those stations transmits its callsign, and a long dash for exactly 1 minute. A ship's radio operator then has the bearings of each signal on his ship's position, allowing for a quite precisely position determination. In this example, Gatteville transmits 'FG' and a long dash in minutes 00, 06, 12, 18, 24, 30, 36, 42, 48, and 54 of each hour, whereas Le Havre transmits 'LH' and a long dash in minutes 04, 10, 16, 22, 28, 34, 40, 46, 52, and 58 of each hour. Other stations listed do it accordingly. Such networks were used very widely in coastal areas, and some are still used (black sea, for example). Nowadays, global positioning systems like GPS are used.

 

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Callsigns:
FG

 

Frequencies Morse Telegraphy:
291.5
291.9
297