Its range is 16 - 17 km ( 9 nautical miles ) .
The islet also has its own lighthouse , its class of light is Fl ( 3 ) W 15s. and has a focla height of 7 metres .
islet 's range is 16 - 17 km ( 9 nautical miles ) .
The islet also has its own lighthouse , its class of light is Fl ( 3 ) W 15s. and has a focla height of 7 metres .