Floating disk compass

Floating non-gimballed compass

Fluid-actuated level device

Fluid-based acceleration and tilt sensor

Fluidic clinometer control apparatus

Flux valve compass system

Flux-gate sensor mounting and method

Fork level indicator with magnetic dampening means

Forklift mast position indicator

Forming leveling tool

Four way corner level

Four way utility level

Frame-setting apparatus

Free floating gyroscopic compass azimuth pick-off and rotor driv

Gauge for use in a surgical procedure

Geomagnetic direction sensor

Geomagnetic sensor for auto-calibration of magnetic field...

Geomagnetic sensor for computing azimuth and method thereof

Geomagnetic sensor for detecting azimuth angle and method...

Geomagnetic sensor for detecting dip angle and method thereof