The SC21 Datum Compass is a precision opto- mechanical instrument designed for the primary use of checking the calibration and compass swing of aircraft cockpit compasses. The SC21 Datum Compass is ideal for any application where precision alignment based on magnetic bearings is essential. The instrument can be used anywhere in the world because of the inbuilt adjustment for the elimination of the effects of “magnetic dip”. The SC21 is a compact, robust instrument which is environmentally stable and sealed against the ingress of dust and moisture

SC21 Datum Compass

Front view showing lens

SC21 in case with ancillary items

Rear view showing eye pieces

SC21 Datum Compass
Front view showing lens
SC21 in case with ancillary items
Rear view showing eye pieces