group
grouping
GRS
guard
guided
gun
gyrocompass
gyromagnetic
gyroscope
gyroscopic
  gyroscopically
gyro-stabilized
Hagedoorn
half-life
half-period
half-plane
half-Schlumberger
half-slope
half-space
half-wave
half-Wenner

    gyroscopically stabilized platform

    гироскопически стабилизированная платформа, гироплатформа