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NAV Displays
Operations
The Track and Bearing Nav item is depicted below. The display indicates
the current magnetic track and the magnetic bearing to the To waypoint.
When the track and bearing are the same, you are flying directly toward the
waypoint, and only the track is displayed. In this example, the track is 251°
and the bearing is 253°. The bearing is displayed on the left or right,
depending on whether the bearing to the waypoint is to the left or right of the
current track.
The Estimated Time En route (ETE) Nav item is depicted below, and
shows the ETE to the To waypoint for the current leg. In this example,
the ETE to DFW is 2 hours, 43 minutes.
The (DTK) Desired Track and Distance Nav item is depicted below,
and shows the desired track and distance between the From and To
waypoints. The desired track is the magnetic bearing to the To
waypoint from the From waypoint. In this example the DTK is 235°
and the distance between the From and To waypoints is 97.8 nm.
Distance can also be displayed in kilometers.
The Minimum Safe Altitude (MSA) Nav item is depicted below. The
MSA is the elevation of the highest obstruction near the aircraft, with
1,000 or 2,000 feet added for safety. Near means that the aircraft is
within 5 nm of a 1/4° grid that contains the obstacle.
In non-mountainous terrain, (less than 5,000 feet), 1,000 feet is added.
In mountainous terrain (more than 5,000 feet), 2,000 feet is added. In
the example, the MSA is 12,000 feet.
The Minimum En Route Safe Altitude (MESA) Nav item is depicted
below. MESA is defined as the highest MSA for every point between
the plane's present position and the current "To" waypoint, with a
5 nm buffer around the course.
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