Say I got one and linked my 787 to 797 -

I hit "mark" and store a waypoint on one unit. Lets call it "A"

I understand it is supposed to show on the screen of second unit. "B"

But is it actually stored in the memory of second unit "B"?

If I dismount unit "B", say to use in another boat, do all the shared
waypoints come along for the ride? Or only show when it's still linked?

I'm afraid I know the answer to this, but wanted to ask anyway.