United States Virgin Islands and British Virgin Islands, the Turks and Caicos Islands drive on the left. The territory's main international ports and harbours are on Grand Turk and Providenciales. The islands have no significant railways. In the early twentieth century East Caicos operated a horse-drawn railway to transport sisal from the plantation to the port. The route was removed after sisal trading ceased. Spaceflight From 1950 to 1981, the United States had a missile tracking station on Grand Turk. In the early days of the American space program, NASA used it. After his three earth orbits in 1962, American astronaut John Glenn successfully landed in the nearby ocean and was brought back ashore to Grand Turk island. Postal system There is no postal delivery in the Turks and Caicos; mail is picked up at one of four post offices on each of the major islands. Mail is transported three or seven times a week, depending on the destination. The Post Office is part of the territory's government and reports to the Minister of Government Support Services. Media Mobile phone service is provided by Cable & Wireless Communications, through its Flow brand, using GSM 850 and TDMA, and Digicel, using GSM 900 and 1900 and Islandcom Wireless, using 3G 850. Cable & Wireless provides CDMA mobile phone service in Providenciales and Grand Turk. The system is connected to the mainland by two submarine cables and an Intelsat earth station. There were three AM radio stations (one inactive) and six FM stations (no shortwave) in 1998. The most popular station is Power 92.5 FM which plays Top 100 hits. Over 8000 radio receivers are owned across the territory. West Indies Video (WIV) has been the sole cable television provider for the Turks and Caicos Islands for over two decades and WIV4 (a subsidiary of WIV) has been the only broadcast station in the islands for over 15 years; broadcasts from the Bahamas can also be received. The territory has two internet service providers and its country code top-level domain (ccTLD) is ".tc". Amateur radio callsigns begin with "VP5" and visiting operators frequently work from the islands. WIV introduced Channel 4 News in 2002 broadcasting local news and infotainment programs across the country. Channel 4 was re-launched as WIV4 in November 2007. In 2013 4NEWS became the islands' first high-definition cable news service with television studios in Grace Bay, Providenciales. DigicelPlay is