Quicksilver ADDICTIV 2.0 Instruction Manual page 6

In time mode, current time is displayed on the top half of the display. Tide
status on the last 6 hours and the coming 18 hours of your selected local spot
are displayed on the bottom half of the display in a graphic form. You can easily
see both the last tide status and the future tide status at a glance. The tide
graph will be updated every 30 minutes.
Dual Time:
This watch has two time zones. Press the "START/STOP" key to toggle
between two time zones.