Quote Originally Posted by betahash View Post
I think, without confirm with syzygy, ISM is no way to work with Venus, nor could it be Venus-ed.
It's not clear to me if ISM.IDX contains any shifted data that needs to be corrected or not. Judging by its extension IDX, I guess it should contain indices for searching purpose only and needs no correction.

If you have an official Garmin China device, you certainly can choose to install the official map or the Venus (optionally with QSI and ISM) map. Just need to make sure the shift adding feature provided by the bin file is or is not activated respectively. For all other devices, Venus map (without QSI and ISM) is the only choice left for China NT map.