In some situations it is simply impossible to find your way around when out walking in the countryside, park or forest with only the naked eye for direction & observations. For example, when stopping or moving to view a bird in flight or walking to see something which has caught your eye, you can easily lose track of where you are. The Trekguide digital compass from Celestron features an ability to track the direction you're in so you don't get lost, such as the altitude, air & sea pressure & the weather forecast, avoiding the risk of getting caught out with torrential rain. This water-resistant compass comes with a lanyard, backlight LED display, alarm, calendar display & bubble level. CR2032 batteries included.