The sound character emitted by the main foghorn is a Morse code ‘U’ every 30 seconds, and this is controlled by the Orga Navaids Central Control Panel (NCCP). Orga’s FH800(3)EX complies with this requirement. In the UK, main/secondary foghorns are required to meet the UK Department of Energy and Climate Change – standard marking schedule for offshore installations regulations. Solar power system with backup power generatorĪ foghorn signal must be activated whenever the meteorological visibility in any direction is two nautical miles or less.