&sq=Facebook&lang=en&file=File:Elettra.jpg) Elettra
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| History | |
|---|---|
&sq=Facebook&lang=en&file=File:Flag_of_Archduchy_of_Austria_(1894_-_1918).svg){kind=small} | |
| Name | Rovenska |
| Owner | Archduke Charles Stephen of Austria |
| Builder | Ramage & Ferguson Ltd. Leith, United Kingdom |
| Launched | 27 March 1904 |
| Homeport | Lussingrande |
| Identification | HVNR |
&sq=Facebook&lang=en&file=File:Civil_Ensign_of_the_United_Kingdom.svg){kind=small} United Kingdom | |
| Name | Rovenska |
| Owner | Sir Max Waechter |
| Acquired | 1909 |
| United Kingdom | |
| Name | Rovenska |
| Owner | Gustav HF Pratt |
| Acquired | 1914 |
 United Kingdom | |
| Name | Rovenska |
| Owner | Royal Navy – patrol & escort duties |
| Route | Between England and ports of Brest and Saint Malo |
| Acquired | 1914 |
 Italy | |
| Name | Elettra |
| Owner | Guglielmo Marconi |
| Route | Worldwide |
| Acquired | 1919 for conversion to seaborne laboratory |
| Homeport | Genoa |
| Identification | Code letters and radio callsign IBDK |
 Greater German Reich | |
| Name | G-107, NA-6 |
| Acquired | Requisitioned 1943 by German Kriegsmarine |
| Fate | 22 Jan 1944 Destroyed at Diklo near Zadar by allied fighter-bombers |
Elettra was the name of Guglielmo Marconi's steam yacht – a seaborne laboratory – from which he conducted his many experiments with wireless telegraphy, wireless telephony and other communication and direction-finding techniques during the inter-war period.