Orfordness Beacon
... that the pioneering Orfordness Beacon radio navigation system could be used with nothing more than a radio receiver and clock?
... that the pioneering <b id="mwCpo"><a href="./Orfordness_Beacon" id="mwCps" rel="mw:WikiLink" title="Orfordness Beacon">Orfordness Beacon</a></b> <a href="./Radio_navigation" id="mwCpw" rel="mw:WikiLink" title="Radio navigation">radio navigation</a> system <i id="mwCp0">(pictured)</i> could be used with nothing more than a radio receiver and clock?