A situation display device adapted to be equipped in a ship, comprising: an observation data acquiring module configured to acquire observation data obtained by observing at least one of meteorological phenomena and hydrographic phenomena, along with observed locations of the observation data obtained from a GPS or GNSS antenna; a data selecting module configured to select the observation data obtained at said observed location that is within a predetermined range from a set course of the device; wherein the data selecting module is further configured to divide a display target area to form a plurality of partitioned areas; and a display unit configured to display, when a display screen is oriented vertically, on a bottom side of the display screen, a location of the device with respect to the course, and display the course linearly such that a traveling direction thereof extends upward from the bottom side, wherein the display unit is configured to display, in an upward tapering shape, an allowed off-course area having a predetermined and operator set offset width in a perpendicular direction to the course, wherein a displayed position of the device in said perpendicular direction corresponds to an offset amount of the location of the device from the course, and wherein the display unit is further configured to display the selected observation data at a plurality of positions on the display screen in respective display parts (91Q, 91R), the positions of the display parts (91Q, 91R) corresponding to said partitioned areas, and the positions of the display parts (91Q, 91R) indicating a relation among the location of the device, the course and the observed location of the selected observation data, wherein the display unit is further adapted to display the observation data of which the observed location is close to the device larger than the observation data of which the observed location is far from the device. an observation data acquiring module configured to acquire observation data obtained by observing at least one of meteorological phenomena and hydrographic phenomena, along with observed locations of the observation data obtained from a GPS or GNSS antenna; a data selecting module configured to select the observation data obtained at said observed location that is within a predetermined range from a set course of the device; wherein the data selecting module is further configured to divide a display target area to form a plurality of partitioned areas; and a display unit configured to display, when a display screen is oriented vertically, on a bottom side of the display screen, a location of the device with respect to the course, and display the course linearly such that a traveling direction thereof extends upward from the bottom side, wherein the display unit is configured to display, in an upward tapering shape, an allowed off-course area having a predetermined and operator set offset width in a perpendicular direction to the course, wherein a displayed position of the device in said perpendicular direction corresponds to an offset amount of the location of the device from the course, and wherein the display unit is further configured to display the selected observation data at a plurality of positions on the display screen in respective display parts (91Q, 91R), the positions of the display parts (91Q, 91R) corresponding to said partitioned areas, and the positions of the display parts (91Q, 91R) indicating a relation among the location of the device, the course and the observed location of the selected observation data, wherein the display unit is further adapted to display the observation data of which the observed location is close to the device larger than the observation data of which the observed location is far from the device.