Icon of program: GreatCirc

GreatCirc for Windows

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Editors’ Review

Download.com staff
GreatCirc is a powerful tool for calculating precise distances and plotting geographical paths on a world map. It offers both free basic features and advanced paid options for specialized needs.

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GreatCirc 0/1

  • Pros

    • Calculates Great Circle distance and direction accurately.
    • Plots Great Circle paths and Rhumb Lines on a map.
    • Offers coverage area calculation.
    • Supports point entry via coordinates, map click, or city list.
    • Advanced features include Mercator and Globe map views.

  • Cons

    • Advanced features require paid registration.
    • Globe View requires DirectX.
    • Batch mode has specific file format requirements.
    • Map projection limited to equirectangular in basic view.
    • User-defined map images not supported in basic version.
Icon of program: GreatCirc

GreatCirc for Windows

Download now

Used GreatCirc for Windows?

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Full Specifications

GENERAL
Release
Latest update
Version
2.0
OPERATING SYSTEMS
Platform
Windows
Operating System
  • Windows XP
  • Windows 10
Additional Requirements
None
POPULARITY
Total Downloads
278
Downloads Last Week
9
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Developer’s Description

By Gunamoi Software
Calculate Great Circle distance, and plot points and great circle paths on a world map.
GreatCirc is a tool for calculating Great Circle distances on the earth's surface, and plotting points and great circle paths on a world map. Anyone may download and install GreatCirc 2.0 to access the basic features free of charge. Registration and payment is only required to unlock the Advanced features of the program. 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.Who's it for? Ham radio amateurs, to calculate antenna pointing for the most direct radio path. Muslims calculating the praying direction (qibla) to Mecca. Educators teaching principles of mapping or navigation. Planners calculating coverage areas, for radio/radar systems, search & rescue missions, etc. And anyone with a general interest in distances between geographic points, or plotting their travels on a world map. 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, or by clicking on the world map, or choose map points from a built-in list of Major Cities.Advanced Features (requires Registration)Main Window View the world map in Mercator projection or Globe View. (requires DirectX). Zoom and move or rotate the world map or globe. Save the map image to file, complete with lines or coverage area. Save the calculation results to file in HTML or CSV format. Calculate the magnetic compass directions, in addition to the True azimuths. Choose map points from a user supplied list file.Batch Mode Window Load a batch of locations and paths from a user supplied text file. Plot multiple great circle lines and label locations on the flat world map. Load alternate map images. Save batch Great Circle Distance calculations in HTML or a CSV formats.
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