Hi Martin,
I believe when using the synscan hand controller, it's advisable to use stars of a reasonably similar altitude and at least 60° difference in azimuth, so the Hadar/Acrux pairing are possibly a little close together to give the best alignment possible. I've been using the Synscan Wifi adapter and Synscan App, and have generally been using Rigil Kent / Canopus, Rigil Kent / Regulus, or Rigil Kent / Sirius as my two alignment stars, depending where in the yard I've set my scope up.
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