Honeywell International Inc.

Honeywell G.m.b.h.

Edward W Ronish

John G Meeker

John F Dawson

Timothy C Dropps

Mark Roff

Methods and apparatus are provided for an azimuthal equidistant projection (AEP) aircraft navigational display. The apparatus comprises a generator providing the aircraft's current latitude and longitude (&#x3c6;,&#x3bb;), a user input for providing the desired map radius R, a display for presenting the navigational information, a map data source providing topographical information associated with geo-spatial coordinates, and a controller and memory coupled to the generator, data source, input and display for providing data transformations. Map data containing topographical information associated with each geo-spatial coordinate is obtained from the map data source for an area of approximately radius R from (&#x3c6;,&#x3bb;). Using the controller and memory, the geo-spatial coordinates are converted to AEP spatial coordinates so that the topographical information is now associated with such AEP spatial coordinates. The transformed map data is sent to the display to provide AEP navigational information on the display around (&#x3c6;,&#x3bb;).

Azimuthal equidistant projection navigation display and method

A method for storage and retrieval of digital map data representative of a tessellated sphere including five zones. Firstly, the number of tessellations for each zone is defined. Secondly, the range of each zone is defined. Next, the radius of the sphere is defined. A sphereical data base is then created by warping the digital map data into the spherical data base by latitude and longitude. Finally, data from the spherical data base is retrieved and the data may be displayed on a cathode ray tube (CRT) display or a flat panel liquid crystal display.

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Laurel, MD, United States of America

Edward W Ronish