Jim
Yes, It's a shame the INS has always been very limited in helo ops.
My exposure was mostly in FW days, with the old Carousel IV followed by the Litton 92. But in long range ops, the accuracy of even this aged equipment was sometimes startling.
I think the a/c to a/c update could be a real boon though...
It's little more than an extension of TCAS and imagine getting updates from a high flying heavy (ies) all the way down to MDA...If we say the LOS @ FL330 is roughly 220nm...It wouldn't be often you'd be out of LOS of someone who is getting constant updates themselves...
Yeah! Tooth fairy stuff
170'