TITLE: Azimuth vs Yaw?
QUESTION [5 upvotes]: What is the difference between these two terms, or are they completely synonymous?  I have frequently seen either used in connection with pitch and roll.

REPLY [5 votes]: There are others probably more qualified to speak on this subject than I, but from what I've gleaned from the Wikipedia pages on Azimuth and Yaw:
Azimuth seems to be used to represent an absolute heading, while yaw is a measurement of how much a craft turns from its current orientation.
Thus, if your azimuth went from $90^\circ$ to $184^\circ$, your yaw was $94^\circ$, while your current azimuth is $184^\circ$.