18 Bit Magnetic Rotary Encoder


Hi.......I have modified the mount several times using onstep such as EQ5,CG4 dan EQ3-M. I'm planning to add a rotary encoder to my mount. I'm currently using MAX STM. There are a few things I want to ask.
1. What type of encoder is currently supported with onstep?
2. Is the encoder used only to correct pointing error or can it also correct tracking error?
3. I found a cheap 18 bit magnetic encoder on Aliexspress, does it support onstep? https://aliexpress.com/item/1005003961485963.html?spm=a2g0o.cart.0.0.17853c0072u7hH&mp=1&gatewayAdapt=glo2idn  

Best Regards, 

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