Studying them at the moment, along with 7 other subjects!!
Strikes me that the majority of the JAA syllabus is fixed wing biased and the whole process is just a burning hoop we have to leap through in order to get an ATPL level qualification.
IMHO the information regarding the separate free standing instruments we use (compass,DI/ASI/VSI etc) is relevant, although I'd like to see any heli get an AI to correctly show an acceleration error.
The integrated stuff (INS/FMS) is it seems purely big jet stuff that the JAA require us to learn about in order to reach the theoretical level required.
What is a machmeter anyway? Hope I never need one....