JohnN,

You're probably right, I was just questioning the appearance, visibility as "seen" through NVG's.

Given the choice I'd take both, have a strobe as a visible and comforting indicator that I'm trying to save myself and possibly others. And a IR marker to assist those trying to find me. Assuming that a IR marker has a "better", ie more visible signature to night vision equipment. OK possibly not a Glo-toob, but there must be others, I don't know, like I said I've no experience of either NVG's or IR markers.