Links to national lightning database. Allows you to set location/or gps autolocate and define a perimeter. Any strike within perimeter gives notification. Open notification to view distance, direction, and mapped plot of old strikes on map. This has a HUGE use for athletics (from pee-wee all the way up to professionals), golf courses, hikers, and any outdoor enthusiast. Most would pay a premium ($10 up to $100?) of personal funds for yearly subscription.