Editing Waypoints in a HB core unit is a task (to say the least) ...

*Press Menu twice to get into the Main Menu System ...
*Cursor over to the Nav tab ...
*Cursor down to Waypoints Routes Tracks ...
*Cursor right to open Waypoint Management ...
*Cursor to "Sort By" at the top and choose the option that gets closest to the Waypoint in question ....
*Cursor down and highlight the Waypoint in question ....
*Cursor right to open options for that Waypoint ...
*Cursor to highlight Edit ...
*Cursor right to open Edit Menu ...
*Cursor right and left to highlight character needed to change (character chosen will flash)
*Cursor up or down to change character ...
*Change all characters as needed ...
*Cursor to "Save" ...
*Cursor right to activate Save command ...

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Or import into Humminbird PC and edit and import back into head unit ...

Rickie