Cumulus from kflog.org is a free flight navigation app for Android devices, which allows you to create waypoints and track flights on a moving map. The app displays an interactive moving map with built-in waypoints and tracks, as well as a list of the waypoints you have already visited. It also includes the possibility to add and remove waypoints, and to mark them as visited or unvisited. The app can be used for planning your flight and for keeping a record of the sites you have already visited.

The map is based on GPS data, which is used by the built-in GPS receiver or the external Bluetooth GPS receiver.