Humminbird 597ci - Manual (Page 109)

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Delete All Nav Data
(Advanced)
Delete All Nav Data allows you to delete all saved Tracks, Waypoints, and
Routes. The Delete All Nav Data menu option is available when User Mode is
set to Advanced (see Main Menu: User Mode).
This menu option should be used with caution!
To Delete All Navigation Data:
1. Make sure the User Mode is set to Advanced, then highlight Delete All
Nav Data on the Navigation main menu.
2. Press the RIGHT Cursor key to delete all navigation data. The Confirm
dialog box will appear. To delete all navigation data, press the RIGHT
Cursor key once more. To cancel deleting all navigation data, press the
LEFT Cursor key.
Navigation Menu Tab