Groundspeak is breaking out the birthday candles to celebrate the 10th anniversary of geocaching, an outdoor treasure-hunting activity using GPS devices.

The event, Groundspeak’s Lost & Found, is a street carnival-style celebration free and open to the public. It takes place July 4 in Fremont, home to Groundspeak, and features family-friendly summer activities, from a dunk tank to a neighborhood scavenger hunt to geocaching courses of varying levels.

Beginners can visit the Introduction to Geocaching exhibit to learn how this high-tech activity can inspire outdoor play, and serious geocachers can dive right into the action with one of 10 expert geocaches, one for each of the 10 years of geocaching history.

Guests can bring their own GPS device or borrow one onsite for the full geocaching experience.

The Discover Fremont Scavenger Hunt is available for everyone to practice navigational skills through the Fremont neighborhood. Lost & Found team members will be stationed at iconic locations to hand out souvenir puzzle pieces to treasure hunters as they find each site. When participants complete their puzzle, they can exchange it for a limited edition Trackable.

Groundspeak’s Lost & Found takes from 11 a.m. – 3 p.m. in the Evanston Plaza adjacent to the Fremont Sunday Market.

Visit www.geocaching.com or call 206.633.0422 for event details and more information on the art of geocaching.