Wings of Valor : Navigator

The role of the pilot was to get the plane off the ground and into the air. [wings shown last post]  Once airborne, the navigator was to get them where they were assigned.  The wings worn by the one who controlled the course of the plain is shown below.

There was a special symbol placed in the center of the wings.  It seems to have been the symbol of a gyrocompass of sorts.  This was a compass consisting of a continuously driven gyroscope whose spinning axis is confined to a horizontal plane so that the earth's rotation causes it to assume a position parallel to the earth's axis and thus point to the true north.  True north indeed it is.

Are there any folks out there who might be able to better explain this symbol and its meaning?