tracking for its controllers. Virtual cinema Some head-mounted displays are designed to present traditional video and film content in a virtual cinema. These devices typically feature a relatively narrow field of view (FOV) of 50–60°, making them less immersive than virtual-reality headsets, but they offer correspondingly higher resolution in terms of pixels per degree. Released in 2011, the Sony HMZ-T1 featured 1280x720 resolution per eye. In approximately 2015, standalone Android 5 (Lolipop) based "private cinema" products were released using various brands such as VRWorld, Magicsee, based on software from Nibiru. Products released as of 2020 featuring 1920×1080 resolution per eye included the Goovis G2 and Royole Moon. Also available was the Avegant Glyph, which incorporated 720P retinal projection per eye, and the Cinera Prime, which featured 2560×1440 resolution per eye as well as a 66° FOV. The rather large Cinera Prime used either a standard support arm or an optional head mount. Expected to be available in late-2021 was the Cinera Edge, featuring the same FOV and 2560×1440 resolution per eye as the earlier Cinera Prime model, but with a much more compact form factor. Other products available in 2021 were the Cinemizer OLED, with 870×500 resolution per eye, the VISIONHMD Bigeyes H1, with 1280x720 resolution per eye, and the Dream Glass 4K, with 1920x1080 resolution per eye. All of the products mentioned here incorporated audio headphones or earphones except for the Goovis G2, the Cinera Prime, the VISIONHMD Bigeyes H1, and the Dream Glass 4K, which instead offered an audio headphones jack. Remote control First-person view (FPV) drone flying uses head-mounted displays which are commonly called "FPV goggles". Analog FPV goggles (such as the ones produced by Fat Shark) are commonly used for drone racing as they offer the lowest video latency. But digital FPV goggles (such as produced by DJI) are becoming increasingly popular due to their higher resolution video. Since 2010s, FPV drone flying is widely used in aerial cinematography and aerial photography. Sports A HMD system has been developed for Formula One drivers by Kopin Corp. and the BMW Group. The HMD displays critical race data while allowing the driver to continue focusing on the track as pit crews control the data and messages sent to their drivers through two-way radio. Recon Instruments released on 3 November 2011 two head-mounted displays for ski goggles, MOD and MOD Live, the latter based on an Android operating system.