Agreed...wind or offset, on the older Litton units.
Changing tack slightly, I was asked recently which I thought was the 'better' older INS unit, the Litton LTN74 or the Delco Carousel.
In my experience, it depends on what 'better' refers to...the Litton has a longer MTBF, whereas the Carousel was slightly more accurate.
Either of course were quite OK.
Now, going just a bit further, if you take three Litton units, and combine these with a Hamilton Sundstrand newly designed FMS with DME/DME update function, you have
superbly accurate LNAV/VNAV capability long before it was available elsewhere, and if this was not enough, full time engine thrust management was in the mix...even better.
Aircraft?
Why, the Lockheed TriStar, of course, circa 1978, with operators that ordered up the best.
Ahhhh, Lockheed