Abstract: A mapping system is movable over a terrain and operates to generate a map. The mapping system includes a geographical location unit generating location data, a timer generating time data, a pair of different interfaces for inputting flag data, such as a speech interface and a manual interface. The system also includes a processing unit connected to the geographical location unit and to the interfaces. The processing unit has a stored first delay time corresponding to the speech interface and having a stored second delay time corresponding to the manual interface. The second delay time is longer than the first delay time. The processing unit stores current time data and flag data in response to use of a selected one of the interfaces. The processing unit generates compensated time data as a function of the current time data and the delay time corresponding to the selected interface. The processing unit generates compensated location data as a function of the compensated time data.