A display device of a personal watercraft is disclosed. The display device typically includes a memory configured to store a plurality of control modes for controlling components of the watercraft, a controller configured to control the components of the watercraft based on a control mode selected from the control modes, and a display portion that is provided in a display panel positioned in the vicinity of a steering handle of the watercraft and is configured to display operating information of the watercraft based on a signal from the controller while the watercraft is traveling. The display portion is configured to display mode information indicating the watercraft is controlled based on the selected control mode instead of the operating information when the controller controls the watercraft based on the selected control mode.