Abstract: A computer system is disclosed, including a processor unit, arranged to communicate with a memory and a positioning device, the memory including a map database and a task list, the task list including at least one task, where at least one of the at least one task has a location indicator associated therewith. The positioning device is arranged to provide information about a position. In at least one embodiment, the computer system is arranged to compute an estimated travel parameter from a current position to a location indicator associated with one of the at least one task using the map database, to compare the estimated travel parameter to a threshold value, and to generate a warning signal if the computed estimated travel parameter is smaller than the threshold value.