Just to let you know. Although I might seem to be able to operate that Civa INS, I can't really say that its handling is somehow intuitive. In fact, it's not even close.
Which guy in the world would take three number-only display lines, a multi labelled switch and some blinking (or not blinking) signs to advertise an intuitive navigation source for aircraft? Back then, it was high-tech though.

But, I admit, it's fun later, when you get that thing running (somehow) and can experience the awkwardness of operating an oldschool airliner like our beloved 707, 727 and even the B-52.
So good luck, buddy, it's like reading the Matrix for the very first time.  8-)


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Now I am careful about these two mistakes, DME update working well.

Glad to read this. Happy and accurate flights then.  :)