A method for fixing a position of a user apparatus includes the step of starting a fixing session and, within the fixing session, determining a size of a snapshot of a signal of a positioning system depending on the receiving conditions of the signal at the user apparatus, the snapshot being capable of enabling the fixing of the position; receiving, at network equipment, from the user apparatus via a network connection the snapshot; and fixing at the network equipment the position of the user apparatus on the basis of the snapshot.