Same as on repeaters. ?WA7JRD monitoring, listening, etc. ?bear in mind, this is to let people know you are there IF they want to talk to you, not a request for a conversation. ?You can ask "is anybody else listening?"
Just to be clear, my understanding is that it¡¯s OK to call CQ on 2 meters or 440 when you are on the National Calling Frequency Simplex. Is that correct? If not, how do you call on Simplex?