However , for these tests the G4B gyrocompass proved far too inaccurate as it required constant correction for drift .
In order to determine the operational accuracy of Green Satin , a lengthy series of test flights over land and water were carried out from an early Canberra .
For these tests the G4B gyrocompass proved far too inaccurate as Green Satin required constant correction for drift .
In order to determine the operational accuracy of Green Satin , a lengthy series of test flights over land and water were carried out from an early Canberra .