Abstract: A layout of areas to display travel data is easily changed in a monitoring screen so as to effectively use the monitoring screen having a limited area. A travel monitoring system includes a monitoring device that controls a display unit to display a monitoring screen indicating a plurality of travel data items of a first vehicle. The monitoring device reserves a plurality of large-sized areas and a plurality of small-sized areas in the monitoring screen. A travel data item (e.g., vehicle speed) is displayed in the large-sized area. A travel data item or a guidance (mark) indicating a type of the travel data is displayed in the small-sized area. A size of the large-sized area in one of a horizontal direction and a vertical direction is a positive integer multiple of a size of the small-sized area.

Abstract: An ID management unit allocates a first connection ID to a first vehicle in a first period and allocates the first connection ID to a second vehicle in a second period. A correction information acquisition unit connects to a distribution device using the first connection ID and receives correction information for the first vehicle from the distribution device in the first period. The correction information acquisition unit connects to the distribution device using the first connection ID and receives the correction information for the second vehicle from the distribution device in the second period. With the system, it is possible to reduce waste of connection IDs necessary for connection to the distribution device that distributes correction information for realizing high-accuracy positioning.