Premium geocaching.com members only
To delete a list from the GPS:
1. you need to be logged in to your Geocaching.com account on a computer
2. on the left hand side there is a tab for 'Lists'. Open the Lists menu up
3. there is an icon of three dots in a circle 'more' and one of the options is to 'delete' the list. Delete the list and when you re sync your GPS with the website, the list will no longer be there in the GPS.