In October this year FECORE purchased a Meridian model 060070 gyro compass.

FECORE member Rob Durham has the gyro now and has been examining it and conducting tests.

The Meridian gyro compass system manual states, “The Meridian Gyrocompass is a master heading reference instrument that applies the characteristics of a dynamically tuned gyroscope and the effects of gravity and earth rotation to provide a true north reference.”

The calibration procedure requires that the operator input the latitude of the compass and then between 24 to 90 minutes the compass will determine true north.

Our question is exactly what is in operation here? If it is earth rotation which the gyro is sensing then why is the latitude required to be input?

Our plan is to test the calibration to true north with the device on a rotating surface offset to the edge and see if it can identify the actual center of rotation.