Centers, By Bubbler GPS

跟踪中心附近橫跨美國53位置您的旅遊活動

"Centers" are determined to be the geographic center of a state or land mass. The concept is based upon a 1964 study by the USGS where a location was determined to be the "balance point" of the land mass in question. This app allows you to claim centers across the country and track your progress online, and compare against others. More information on the project can be found on our website at http://Centers.BubblerGPS.com

You will need a registered and verified account (free) which can be created on the project website.