Angular displacement measuring apparatus
Arrangement serving to indicate the direction of a given geograp
Attitude meter with rotatable arcuate scale
Compass apparatus
Compass mounting apparatus
Direction finding device and guidance system
Electromagnetic compass
Heading sensor
Inclination and direction responsive apparatus
Low profile compass with removable protective cover and...
Pendulum level
Plumb measuring device
Static non-swinging course determining device on a vehicle
Up, down or horizontal plumb bob