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 in 'Sequence 6' transmits 'FG' and a long dash in minutes 05, 11, 17, 23, 29, 35, 41, 47, 53, and 59 of each hour, whereas Le Havre in 'Sequence 4' transmits 'LH' and a long dash in minutes 03, 09, 15, 21, 27, 33, 39, 45, 51, and 57 of each hour. Other stations listed do it accordingly, with 'Sequence 1' starting at minute 00 of each hour. Such networks were used very widely in coastal areas, and some are still used (black sea, for example). Nowadays, satellite operated systems like GPS are used.






Frequencies Morse Telegraphy: