Navigational aid
First Claim
1. A navigational aid comprising display means defining a display zone and adapated to display at least one symbol at a variable position in the display zone in reponse to control signals, manual input means comprising a keyboard operable by a user of the aid to generate input signals, and processor means adapted to accept input signals from the input means corresponding to the scale of a map, the speed of a craft, and a time value, to calculate the position of the craft relative to a reference point in terms of the input signals, and to generate display control signals representative of the position of the craft relative to the reference point so that a graphic display of the position of the craft is generated in the display zone, the processor means further being adapted to calculate the distance between a cursor and a reference point and to generate display control signals representative of the distance between two points on the map corresponding to the positions of the cursor and the reference point.
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Accused Products
Abstract
A navigational aid comprises a housing with a flat, transparent liquid crystal display. The display is flat and flush with the bottom of the housing, to allow the aid to be placed flat on a map or chart. The aid is microprocessor controlled and accepts plug in memory modules, which contain information relating to an area through which a craft, for example, an aircraft, is to be navigated. The display generates cursors which can be superimposed on the map. The aid can display graphically the progress of the craft, superimposed on the map, on the basis of input data supplied by the user. Alternatively, the cursors can be moved to measure the distance beteen points on the map.
40 Citations
11 Claims
- 1. A navigational aid comprising display means defining a display zone and adapated to display at least one symbol at a variable position in the display zone in reponse to control signals, manual input means comprising a keyboard operable by a user of the aid to generate input signals, and processor means adapted to accept input signals from the input means corresponding to the scale of a map, the speed of a craft, and a time value, to calculate the position of the craft relative to a reference point in terms of the input signals, and to generate display control signals representative of the position of the craft relative to the reference point so that a graphic display of the position of the craft is generated in the display zone, the processor means further being adapted to calculate the distance between a cursor and a reference point and to generate display control signals representative of the distance between two points on the map corresponding to the positions of the cursor and the reference point.
Specification