Pigboat, what was state of the art at that time.. . <img border="0" title="" alt="[Smile]" src="smile.gif" /> . .. .I am not aware of anything that was better apart from a ground radar fixing service.. .I don't know what replaced it, presumably Tacan.. .. .Certainly Gee mark3 was quick and easy to use, any half decent nav could give his pilot an accurate fix in a few seconds.. .. .As for easy, good heavens, even I could operate it. <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" />