Abstract: A mobile unit is disclosed for generating a summit log entry in an electronic registry of summits. The unit includes (1) a receiver that is adapted to identify a current position and/or a current time, (2) a local memory being adapted to store the current position or the current time, and (3) a transmitter being adapted to transmit a summit log entry of the mobile unit to a central unit having a summit database. The mobile unit is adapted to combine the current time and/or the current position with a reference for a summit and an identification of a user into a summit log entry. The summit log entry cannot be modified by the user, once it has been created. Similarly, the registry of summits—contained within a central unit—cannot be destroyed or stolen.