When the free swinging magnetic needle is directly over the orienting arrow in the bottom of the compass housing (make sure both north arrows are pointing the same way), the compass housing and needle are oriented to magnetic north.
(the compass housing and needle; are; oriented to magnetic north) (the free swinging magnetic needle; is; directly over the orienting arrow in the bottom of the compass housing) (the compass housing and needle; oriented; to magnetic north) (both north arrows; are pointing; the same way), the compass housing and needle are oriented to magnetic north)
the compass housing and needle the free swinging magnetic needle the compass housing and needle both north arrows
are is oriented are pointing
oriented to magnetic north
directly over the orienting arrow in the bottom of the compass housing
to magnetic north
the same way), the compass housing and needle are oriented to magnetic north