| 摘要 |
A calculator, which enables a pilot of an aircraft to determine the distance of the aircraft from a VOR station when the ground speed of the aircraft is known or the ground speed of the aircraft when the distance of the aircraft from the VOR station is known, includes a circular base member having a scale in terms of time thereon. A member is rotatably mounted on the base member and has a plurality of concentrically arranged scales in terms of distance to the VOR station with each scale being for a different ground speed of the aircraft. When a pointer on the rotatable member is aligned at the time required to fly between two bearing radicals of the VOR station that are 20 DEG apart, a transparent fixed indicator having a hairline radially aligned with the center of rotation of the rotatable member and concentrically arranged marks engaging the hairline with each mark representing one of the ground speeds of the aircraft enables either the distance of the aircraft from the VOR station to be determined with the ground speed known or vice versa. The base member has three circular concentric scales on its opposite side divided into 10 DEG increments to indicate the required heading of the aircraft to fly between two bearing radials that are 10 DEG apart.
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