Looking for a "real-time interstellar navigation" program

Hi, All,

I dimly remember a program that was self-described as a "real time
interstellar navigation" simulator.  In reality, I think it was a
random starfield with a clock displayed at the bottom of the screen
that ticked down the distance remaining and time remaining to get to
Alpha Centauri or some other "close" destination.  I _think_ it was a
PET program, but it's possible it was for some other platform.

Does anyone remember such a program?  I'm not looking to write one (or
even run it to completion), but I wanted to show it off for the joke
that it is.

Thanks,

-ethan

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