Navigate means make sure that the plane is flying somewhere safe (not into a cloud, mountain, etc) and figure out where you are geographically if possible, sinc

Navigate means make sure that the plane is flying somewhere safe (not into a cloud, mountain, etc) and figure out where you are geographically if possible, since that is going to be one of the first things they ask you on the radio. The reason they give that advice about communicate is that they are trying to make sure you maintain situational awareness, and a safe state of flight in an emergency. The advice is basically saying that whoever is on the radio can wait until you are ready to talk to them, and have handled all of the important bits. My broader point is that getting the plane straight and level is far more important than the radio, and fiddling with the throttle is not the first step in any scenario that I can imagine.