How do I leave a footmark?

Footmarks of other users will be recorded on your “footmark” list when the other user has his/her Air Profile setting ON, and approaches you within about 300m from your iPhone by a straight line distance.

However, depending on the position of each other and the position-fix accuracy, footmark of the user might be recorded when this user is more than 300m away from you and the footmark might not be recorded even if the user is approaching you within 300m.

Moreover, a footmark of the user cannot be recorded either when the approaching user has his/her Air Profile setting off or when he/she is blocking you. Also, when viewing Sekai Life, footmarks will not be recorded.