 Radio 4 broadcasts the Shipping Forecast, which reached 150 years old in August 2017.The pips are only accurate on FM, LW, and MW; there is a delay on digital radio of three to five seconds and online up to twenty-three seconds.BBC Radio 4 is the second-most-popular British domestic radio station by total hours, after Radio 2 – and the most popular in London and the South of England.