The track points you record can be shared with another user, by nickname.
Nicknames: Note that nicknames are case-sensitive.
You can limit the exposure of your track points to a point in time that is the lesser of the following:
The latter period effectively overrides the former, so there is little advantage in setting a most recently logged period of time that is longer than the overall maximum time period.
Click on the Track Sharing menu option to display the Track
Sharing page. The page lists any tracks you are already sharing with another
user.
Click the New button to share your tracks with another user. Enter the
user’s nickname and set any date range constraints you wish to apply. Check
the Active checkbox when you’re ready to start sharing.