Shows two different things, because they answer different questions. Checked is when we last reached the source. Obs is when the measurement itself was taken, shown for weather and tides, which report a point in time; other feeds have no measurement clock and show only the check. A recent check of an old measurement is not a recent measurement. Thresholds vary by source based on how often that source actually changes; Pacific Watch refreshes every 5 minutes.

Filters which outlets appear under Latest Headlines. Every outlet is fetched regardless — this only changes what is shown, and the setting is stored on this device.