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GreatCirc 2.0


GreatCirc 2.0

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GreatCirc 2.0 Ranking & Summary

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User Review: 0 (0 times)
File size: 2.2MB
Platform: Windows XP
License: Trial
Downloads: 10
Date added: 2011-08-31
Publisher: Gunamoi Software

GreatCirc 2.0 description

GreatCirc 2.0 is known as an easy yet efficient tool for calculating Great Circle distances on the earth's surface, and plotting points and great circle paths on a world map.

The "great circle path" is the shortest direct route between two points on the earth's surface.  Because the earth is a globe, the shortest path between any two points lies on a circle which is centred at the earth's core and passes around the surface of the world.  Such a path will appear to be a curved line when drawn on a flat world map because of the distortion inherent in mapping the globe onto a flat map.  

GreatCirc can calculate the Great Circle Distance between any two points on the earth.  Also, given a starting point, direction and distance it can calculate the Great Circle End Point.  In both cases, GreatCirc will plot the resulting Great Circle path on a world map.  GreatCirc can also do a Coverage Area calculation, given a centre point and a range, GreatCirc will plot the resulting circle on a world map and calculate the area of the earth's surface enclosed within the circle. 

Major Features:

  1. Basic Features (Free)
    • Great Circle Distance calculation: find the shortest distance and direction between two points. 
    • Great Circle End Point calculation: find the end point of a great circle path, given start, distance and direction.
    • Rhumb Line Calculation: find the distance between two points along a line of constant bearing.
    • Coverage Area calculation: find a circular coverage area, given a central point and the radius. 
    • View the Great Circle, Rhumb Line, or Coverage Area plotted on a world map, in equirectangular projection.
    • Enter map points by typing their latitude & longitude coordinates, in decimal, or degrees,minutes,seconds format.
    • Enter map points by clicking on the world map.  Left-click for Point 1, right click for Point 2.
    • Choose map points from a built-in list of Major Cities.
    • Perform calculations using a simple spherical earth model, or the WGS84 standard ellipsoid.
  2. Advanced Features (requires Registration)
    • Main Window
      • View the world map in Mercator projection or Globe View. (requires DirectX). 
      • Zoom the world map to get a closer look, or to more accurately click a location.
      • Move around the zoomed world map, or rotate the Globe view.
      • Save the map image, complete with lines or coverage area, to a bitmap file.
      • Save the calculation results to a HTML Report file, or to a comma separated text file for loading into a spreadsheet.
      • Calculate and display the magnetic azimuths (compass directions), in addition to the True azimuths.
      • Choose map points from a user supplied text file.
      • Switch to Batch Mode.
    • Batch Mode Window
      • Load a batch of locations and paths from a user supplied text file.
      • Plot great circle lines and label locations on the flat world map.
      • Choose a mix of colours for lines and labels. 
      • Load alternate map images.
      • Zoom and resize the map image.
      • Save the resulting map images, with lines and labels, to a bitmap file.
      • Treat batches of locations as a series of connected waypoints, or as a star with the first point as hub.
      • Save batch Great Circle Distance calculations in a HTML Report file, or to a csv file for loading into a spreadsheet. 


  • New Features
    • Basic Features (Free)
      • A new tab to do Rhumb Line calculations.
      • New Major Cities Tool to let user select points from built-in list of Major Cities.
      • Improved transparent coverage shading option, now default.
      • Right-click on coverage map now sets coverage edge.
      • Option to draw latitude/longitude grid lines on map.
      • User can now enter decimals into degrees box and program will calculate and overwrite minutes and seconds.
    • Advanced Features (requires Registration)
      • World Magnetic Model updated to latest WMM2010.
      • Magnetic azimuths now displayed on calculation tabs and included in saved reports.
      • New Mercator Projection and Globe View options. (requires DirectX)
      • New Tool to allow user to select points from a user supplied text file list.
      • In Batch Mode, can zoom (left-click) and unzoom (right-click).
      • Can open another batch file without closing batch mode.
      • Option to load an alternate map image in Batch Mode.
      • Batch Mode will now query whether to treat a plain input file as a series of waypoints, or as a star (hub & spokes).
      • User can now specify new Star 'S' command in the input file format.
      • Improved look and layout of HTML report files.
      • Spherical Earth/WGS84 Ellipsoid options now also available in Batch Mode.
  • Bug Fixes & Other Refinements
    • Fix to Vincenty algorithms to ensure they complete, and don't lock up.
    • Fixed bug on main window map zoom which made map creep.
    • Hiting Enter key in a text box now forces a calc, instead of just beeping.
    • Fixed some memory leaks.
    • Coverage options now greyed out when not on coverage page.
    • Magnetic Azimuth tool not available on Coverage page.
    • Fixed title on Save Results file selection dialog box.
    • Closing Batch Mode Window now ends the program.
    • Azimuths now shown only to 1 decimal place.


  • A PC running Windows XP (see this link for tips on using the program under Windows 7).
  • 6MB free hard disk space.
  • Screen resolution set to at least 800x600 (1024x768 preferred).
  • If you choose to register, you will also need DirectX v9 or later to support the globe view option.  

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