So let's say I have a Madine MC80 Liberty with a CF command going speed 3. During the move, I use a nav token for extra yaw. Does that satisfy the condition for me to now use ET at the end of the move?

You have issued a Nav command through utilising a Nav Token.

That is the requirement for using Engine Techs.

That's what I thought. Thanks Dras!

You can even spend the token and do no action related (i.e. no speed change or yaw change in case of Madine), and still do the Engine Techs