Sorry Scud, but don't agree. Have seen it far too many times when quite experienced pilots (Not just PPL's) fly aircraft that have an HF installed and don't have a clue on any HF basics or how to operate it. It is just assumed in many cases and I suspect not taught in others because the instructor/training pilot did not get taught either. How many pilots have you seen flying around with the squelch open and not knowing how to set it up?? And then they complain because of the noise they "have" to listen to all day.. Hello, anyone home!!??
A similar thing is going on with GPS. One is expected to know how to operate whatever is in the aeroplane. Sometimes it just aint that easy. (and you think the book is always in the aeroplane?)
Just another example of why the industry is going down the drain with such poor instructing standards. (and this is on the tip of the iceburg)