Yes, it is suppose to warm you of any serve weather in your area it uses the gps and a satelite to track your location for bad weather.Under the veiw mode it creates a weather screen, that shows your location and the storms location. If you have gps on your humminbird unit you can purchase the antenna and a y cable that the weather antena and the gps goes into the gps port on the back of the unit for about 183 on ebay verus 225 at humminbird or dealers. the subscription is about 120 a year