LocationSwap
LocationSwap is an iPhone app that allows you to keep track of the location of friends or other people you choose to connect with. Friends locations are shown on a series of maps, with options for map style and zoom level for each. The app does not require sign-up or login a Google account and personal data is not shared outside of the connected friends. The GPS is automatically powered off when the user is stationary. The app is free for keeping track of a single friend, and upgrading allows unlimited friends as well as scheduling movement alerts.