When BBC Radio 4 took over the longwave frequency from Radio 2 on 23 November 1978, the Shipping Forecast moved to Radio 4. The last broadcast of the Shipping Forecast at 0048 each day is traditionally preceded by the playing of "Sailing By", a light orchestral piece by Ronald Binge. This is only very rarely omitted, generally when the schedule is running late. Though occasionally played in full, it is common for only a section of the piece to be broadcast; that section being the length required to fill the gap between the previous programme's ending and the start of the forecast at precisely 0048. "Sailing By" serves as an identification tool – it is distinctive and as such assists anyone attempting to tune in. The forecast is then followed by the national anthem "God Save the Queen" and the closedown of the station for the day, with the BBC World Service taking over the frequencies after the pips of the Greenwich Time Signal at 0100. The Shipping Forecast should not be confused with similar broadcasts given by HM Coastguard to vessels at sea tuned into Marine VHF and MF radio frequencies. HM Coastguard's broadcasts can only be heard by vessels or persons using or tuned into marine VHF and MF radio frequencies, whereas the Shipping Forecast can be heard by anyone tuned into BBC Radio 4. The Coastguard's broadcasts follow the same format as the shipping forecast using the same terminology and style, but the information only normally applies to the area sector or region covered by that particular Coastguard Co-ordination Centre (such as the Bristol Channel, for instance). Announcements of pending broadcasts by HMCG are given on marine Channel 16 VHF and is announced with "Securite. All stations. This is Milford Haven Coastguard... For the Maritime Safety Information, list on Channel 62. This is Milford Haven Coastguard." A similar broadcast on MF is initially announced on 2182 kHz, with a further frequency specified, e.g., 1770 kHz. VHF optimum range is approximately 30 nautical miles (NM), effectively line of sight, whereas MF range is much greater at approximately 150 NM, allowing ships in the Atlantic Ocean and North Sea to receive the broadcast. On 18 December 1993, as part of the Arena Radio Night, BBC Radio 4 and BBC 2 collaborated on a one off simulcast so the shipping forecast – read that night by Laurie Macmillan – could be seen as well as heard. To date, it is the only time that it has been broadcast on television.