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I must admit I thought the Garmins only displayed which number on the cassette you were in. IE 1 or 2 or 3 etc.
If you enable syncro shift on Di2 you set the actual cassette ratios in the e-tube app which then updates the system on the bike so it can calculate how to select the next gear inch you are going up or down the gear inch range (sorry for wording tried but failed to make it clearer).
Blimey, replacing a ten year old 705 with a 530 is quite a leap. I've figured out the necessities, including getting it talking to my Di2 - swapping pages using the hood buttons is gonna be very handy.
Only thing I'm struggling with is the gear info, which seems to think I'm using an 11-23 cassette and I can't figure out how to change it to 11-28. Wondered if it was getting the cassette specs from the Di2, but it's all showing correctly in the e-tube android app. The chainrings are right, but I'm assuming that's just coincidence.
It's not something that I need, but still annoying me that it's wrong.