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Switch S1 connects directly to the J3 (Red) and J4 (Black) Test Jacks:
Many aircraft (and other vehicles) have a heading system that is a combination of a number of different sensors all working toghther to tell, at any instant, the heading. One of these is the magnetic heading sensor. Typically an electronic type like a flux gate magnatometer. In order to verify that the magnetic sensor on an aircraft is correct you need a calibration standard for magnetic filed.
Model No
MC-1
Condition
Used
Manufacturer
Sperry