Embark on a high tech scavenger hunt, using your phone to sniff out any of a million-plus geocaches hidden by players in more than 100 countries. The app grabs GPS data to list nearby spots and provides coordinates to help you pinpoint them. Don't expect treasure — just a logbook and maybe some trinket — but the hunt is plenty rewarding.
WIRED Photos to help if you're stuck. Online logs and field notes let others know about your find.
TIRED Compass can be unreliable. Overstuffed interface.