Hello, in order to use ESS, must I have a GX device such as Venus or Cerbo? If so, which is better?
Yes, you need a GX device.
As far as which one id better, the choice is yours. Take a look at the comparison table to help you decide which one suits you better.
The CerboGX is the later model and allows connection of an external display touchxreen whereas the VenusGX does not.
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