Linking the Two Timelines in Compare Mode

In compare mode, each pane steps through its own timeline by default. A link icon at the end of each pane's timeline strip couples them to the same-pass-type nearest match: here's exactly where it is and how it behaves.

Where's the link control?

It's not on the divider between the two panes: that bar is just a visual separator. The actual toggle is a small chain icon at the right end of each pane's own timeline strip, next to the legend toggle and the gaps indicator. Either pane's icon controls the link for both.

Is timeline lock on by default?

No. The two timelines are unlinked by default. You have to click the chain icon to couple them; a cyan icon means linked, a dim one means each pane moves independently. Your choice is remembered for next time.

What happens when I switch a pass with lock on?

Selecting a pass in one pane moves the other pane to whichever of its own passes has the closest capture time, but only among passes of the same type. A satellite pass on one side only pulls the other side to another satellite pass; a composite only pulls to another composite. That matters because it's why linking a satellite-pass pane to a composite-only pane sometimes does nothing at all: if the other pane has no pass of the matching type, it simply stays where it is rather than jumping to something unrelated.

Why would I want the timelines unlinked?

Unlinked is useful for browsing two independent moments: say, today's SST against last week's to see how a break has moved. Linked is useful for holding the same moment in time while you switch layers or sources on each side. See using the timeline for how ordering, dead passes, and retention work on a single pane, and pricing for which satellite passes your plan covers in each region.