The Charts view can show a chart for any session of recorded position data. Each session can cover an extended period, such as a full night's sleep. (Sessions are separated by gaps of four or more hours without recorded data.)
Tapping a chart will show or hide additional information and a chart toolbar.
You can change from one chart to another by swiping left or right, or by using the arrow buttons on the chart toolbar.
Each chart shows the full duration of its session, starting near the top of the screen and extending to the tab bar at the bottom, with time labels along the left side. (The format of the time labels, such as the use of 12-hour or 24-hour formats, depends of your device settings.)
Sleep position information is indicated by the trace, a bright line on the chart. The left-to-right position of the trace corresponds to the changing left or right tilt of the device. The background colors on the chart indicate named positions: violet for facing left, red for facing up, gold for facing right, and green for facing down. (Green areas near both the left and right edges of the chart indicate positions that are close to a face-down position. You can think of the chart as wrapping around from one edge to the other, much like a map of the world.)
Dark vertical grid lines are spaced 45 degrees apart. The spacing of the horizontal grid lines depends on the duration of the session.
The color of the trace indicates whether the device was upright. It is white or off-white for times when the device (and, presumably, its user) was lying down, and blue for more upright positions (as when the user was sitting or standing). (When the user is walking around, the blue trace tends to shift significantly from side to side, often causing an irregular blue band across the chart.)
Tapping on a chart will show or hide a translucent overlay of additional information, and a chart toolbar. By default the overlay appears near the top of the chart, while the toolbar appears at the bottom. Either can be dragged up and down to other positions. A more button at the lower right of the overlay will show additional detailed statistics.
The chart toolbar shows several icons:
The red badge on the Charts tab shows the approximate total duration of all the SomnoPose position data currently stored on your device. Although SomnoPose imposes no specific limit on the amount of data it can handle, keeping data from many nights may eventually cause slower performance for startup, deletions and other operations.
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