Bench testing / learning APCC with JPL Horizon for ISS


Hello all,

Is there a way to play with APCC and JPL horizons without mount  connection to practice for ISS?
I mean some way where the software emulates the mount and allows me to run the JPL ephemeris and mimic the tracking of ISS on my desk?
Just trying it I get a big blinking display 'No response from mount'. Any way to get to a better practice session?


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