I think you're misreading what Kurt is saying. The OP has listed three DUAL deployment altimeters. Thus why the NAR report (no, I didn't log in to read it,but based on Kurt's comment, I assume the NAR report is on reading altimeters only) is a non issue. I also agree that the Marsa IS not one to consider, when the OP listed two plug and play altimeters. The RRC3 is also, but does much more. Which is why I suggested the RRC2+, as it more closely matches the other 2 altimeters listed. The Marsa is a fine unit, but HUGE size wise and far more complicated to set up. I used mine once so far, and had deployment issues(nothing serious, just popped at the top), but that was not the altimeter's fault. I'm not entirely sure I programmed it correctly, AND I used an unfamiliar altimeter as back up. SO, as the old saying goes YMMV. And enjoy the foray into dual deployment!!!