Hand-held distance-measurement apparatus and system
Hand-held laser level with retractable adhesive-type...
Hand-held level and plumb tool
Harmonic phase modulation error reducer
Hazard detection for flight plans and the like
Heading indicator
Heading reference and land navigation system
Heading reference system
Heading reference system with remote-mounted sensor
Height estimating apparatus
Height generating satellite navigation system
Helicopter maneuver margin indicator
Helicopter warning system
Hemispherical resonator gyro
Hemispherical resonator gyro control
Herbicide
Hexagonal patch printing for orthophoto printers
High altitude parachute navigation flight computer
High contrast spirit-level vial
High efficiency magnetic shield