Supra Vision Control Owner's Manual page 50

Chart and Time
This section allows you to choose if Grids, Text,
Waypoints, Tracks and Navigation Aids will be shown on
the Map.
This section also provides a way to offset the GMT time
by choosing the number of hours difference between
GMT and your location.
Lastly, choose to enable or not Daylight-Saving Time
and choose between a 12-hour (1:00pm) or a 24-hour
clock display (13:00).
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