Hello!
In garmin connect it would be nice, to add offset or remove heading from one of the comparing data to shift the activities synchron. Screenshot onby

Yes, it would be indeed handy. I recommend suggesting it to Garmin at Share Ideas | Garmin. In the time being you could use the Trim function as a workaround (appart of using 3rd party apps), and trim the start of one of the activities to match the other one. It is fully reversible, so you do not need to fear losing the trimmed data.
Currently it's only distance, or did I miss any settings?
You can indeed have both of it, in GC Web (and this is a GC Web forum)
