Humminbird 778C - Manual (Page 95)

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Target Highlight: Highlight a target on the Target List, and press the
RIGHT Cursor key. The Target List will close and the active cursor
will go to the target you highlighted. Press the EXIT key to remove
the active cursor from the screen.
Target Course Line turns course lines off or sets the amount of time
represented on the target course line. The length of the course line
indicates the last known ship speed, while the direction of the arrow
shows heading. (Settings: Off, 00:00 - 59:59; Default = 5:00)
MMSI Label (Maritime Mobile Service Identity) sets the MMSI label
information to be Visible or Hidden. (Settings: Visible, Hidden; Default =
Visible)
AIS Target List
Accessories Menu Tab