Music and sport are the only subjects that generally fall outside the station's coverage. There are occasional concerts on Radio 4, and ball-by-ball commentaries of most test matches played by England cricket are broadcast on longwave. Because the longwave service can be received clearly at sea around the coasts of Britain and Ireland, Radio 4 also carries regular weather forecasts for shipping and gale warnings. The station has also been designated as the UK's national broadcaster in times of national emergency such as a war, meaning that even if all other radio stations were forced to close, Radio 4 would still carry on broadcasting.