PPRuNe Forums - RNAV vs. RNAV Overlay Approaches

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RNAV vs. RNAV Overlay Approaches

Hello everybody
I have to do a little presentation about the differences and similarities of RNAV and RNAV Overlay Approaches.... However, besides the normal differences such as: RNAV needs GPS only, no Ground navigation such as VOR or NDB, I dont find that many differences... Anybody has some good ideas how I can make a nice 5 to 10 minutes presentation on that topic...? Have to do it in order to become a synthetic flight instructor... My Airline is doing a little assessment center...

Greetings and thanks

Phicongduc