Raymarine E90W User Reference Handbook page 243

Performing a settings and data reset
Performing a settings and data reset erases ALL waypoints,
routes, and track data from your multifunction display.
BEFORE proceeding with a settings and data reset, ensure
that you backup any data that you want to keep on to a
CompactFlash card.
1. Press the MENU button.
2. Select System Setup.
3. Select Settings and Data Reset.
4. If you have password-protected your waypoints, enter your
waypoint password and press the OK button.
5. Select the YES option to perform the reset, or select the NO
option to abort.
Maintaining your display
243