Could I also add, it would be nice if aircraft fitted with Transponders
turned them on, even where there is no radar coverage in class G!!
It is amazing the number of times we are inbound to an uncontrolled airport, when someone calls airborne in a Baron, Chieftan, 402, etc... without turning on their transponder. A polite "could you please activate your transponder"? and then "look there they are, we are going to miss them, not where they said they were after all..."
(it is considerably easy to visually acquire a target after first having their position from TCAS)
In the past I have always turned on my transponder even in the most remotest of places, it is interesting just when/where the transponder has been interrogated, let me just say, you certainly want to have it turned on if you fly in an area where there is lots of military jets getting around!!