Horizontal Situation Indicator MFD
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HSI, horizontal situation indicator MFD mode, is used to navigate and align with a runway at a spaceport, and to follow the proper glideslope for landing, or to align with a VOR transmitter to achieve a desired heading relative to the VOR. HSI is similar to aircraft instrument navigation systems.
HSI consists of two displays, left and right. Each can be slaved to a COMNAV frequency, NAV 1, 2, 3, or 4. The display consists of a gyro-compass indicating the vessel heading at the 12 o'clock (top center) position. In center is a yellow arrow which is the Omni Bearing Selector (OBS) or course arrow.