the web and as a mobile app (formerly the CBC TV app). Gem also offers a premium subscription including ad-free video on-demand, as well as CBC News Network. New and upcoming shows like TopLine can be watched on CBC Gem. Children's programming Children's programming, often marketed as "CBC Kids" and "The Outlet", occupies most of the morning hours on weekdays and much of weekend mornings. CBC HD On March 5, 2005, CBC Television launched a high definition simulcast of its Toronto (CBLT-DT) and Montreal (CBMT-DT) stations. Since that time, the network has also launched HD simulcasts in Vancouver (CBUT-DT), Ottawa (CBOT-DT), Edmonton (CBXT-DT), Calgary (CBRT-DT), Halifax (CBHT-DT), Windsor, (CBET-DT), Winnipeg (CBWT-DT), and St. John's (CBNT-DT). CBC HD is available nationally via satellite and on digital cable as well as for free over-the-air using a regular TV antenna and a digital tuner (included in most new television sets) on the following channels: All HD channels map to their analogue positions via the North American PSIP virtual channeling standard. In fall 2007, the CBC upgraded its Toronto facilities, becoming the second fully HD news broadcaster in Canada. The National and all its news programs originating from the same news studio in Toronto (including CBC News: Sunday Night) are now available in HD. On September 1, 2011, as part of the analogue television shutoff and digital conversion, all CBC over-the-air HD broadcasts switched from the 1080i to 720p resolution format. In August 2012, after the CBC shut down all of their remaining analogue transmitters, CBC television (as well as CBC News Network) began broadcasting all programming solely in the 16:9 aspect ratio and began letterboxing its widescreen feed for standard definition viewers just as Ici Radio-Canada Télé has done since September 2007. Stations All CBC television stations, including those in major cities, are owned and operated by the CBC itself. CBC owned-and-operated (O&O) stations operate as a mostly seamless national service with few deviations from the main network schedule, although there are some regional differences from time to time. For on-air identification, most CBC stations use the CBC brand rather than their call letters, not identifying themselves specifically until sign-on or sign-off (though some, like Toronto's CBLT, do not ID themselves at all except through PSIP). All CBC O&O stations have a standard call letter naming convention, in that the first two letters are "CB" (an ITU prefix in the CA-CE block allocated