Gyros or angular rate sensors, having any of the following and specially designed components therefor: (a) Specified to function at linear acceleration levels less than or equal to 100 g and having any of the following: 1. A rate range of less than 500 degrees per second and having any of the following: a. A ‘bias’‘stability’ of less (better) than 0,5 degree per hour, when measured in a 1 g environment over a period of one month, and with respect to a fixed calibration value; or b. An ‘angle random walk’ of less (better) than or equal to 0,0035 degree per square root hour; or Note : this paragraph does not apply to ‘spinning mass gyros’. 2. A rate range greater than or equal to 500 degrees per second and having any of the following: a. A ‘bias’‘stability’ of less (better) than 4 degrees per hour, when measured in a 1 g environment over a period of three minutes, and with respect to a fixed calibration value; or b. An ‘angle random walk’ of less (better) than or equal to 0,1 degree per square root hour; or Note : this paragraph does not apply to ‘spinning mass gyros’. (b) Specified to function at linear acceleration levels exceeding 100 g.