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
half-width
hammer

    Hagedoorn method

    способ разностного годографа