Garmin GPS 400 Pilot's Manual And Reference page 107

To review and/or modify a user waypoint from the user waypoint list:
d
E
E
To rename a user waypoint from the user waypoint list:
d
a
E
To delete a user waypoint from the user waypoint list:
d
c
d
d
E
E
WPT PAGES
Modifying / Deleting
User Waypoints
5
Ž
b

b
Ž
c