To hide older tracking data from your friends and family on MapShare please follow these steps:
1. Login to explore.delorme.com.
2. Click on the "Social" tab.
3. Click on the "Filter MapShare Data" button.
4. Click on the date field under "Hide Older MapShare Data" and click on a date.
5. Click on the "Save Changes" button when completed.
Now MapShare users will only see MapShare data that is generated after the date you have selected.