根据 https://robertsspaceindustries.com/spectrum/community/SC/forum/190048/thread/star-citizen-alpha-4-0-eptu-patch-notes-8
Advanced Flight HUD
Enabling the option to display the new Advanced HUD which is aimed for pro pilots. This new HUD is optional and off by default and can be enabled per ship on the ship configuration page or fully enabled through the in game options. This advanced HUD allows players see more extended information than previous HUD iterations and includes new acceleration displays, orientation, VSI, radio altimeter(r-alt) which is the altitude above terrain, above sea level altimeter, atmospheric pressure, and more. This also includes new, interim icons for ship states like landing gear, coupled/decoupled, esp, and more. These current icons are attached below for quick information.
此处的 r-alt 为 Radio Altimeter 雷达高度
Radio altimeter 和 Radar Altimeter 指的是同一种设备。https://grok.com/share/bGVnYWN5_5f9b20b1-70a0-4cb2-b669-5dfa5bc845b9
会在下个汉化版本更新。