qthcalc is a program to convert different representations of geographical locations and calculate distances and great circle angles. This is very useful if you are in the amateur radio scene and need an easy tool to do such calculations for you.

Because an example is better than long explanations, I'll present a screen shot of qthcalc's output:

screen shot

Some more informations on grid locators my be found here.

For some more documentation look at the man page:

• qthcalc

qthcalc 0.0.6 - Mon, 05 Dec 2011 08:13:31 +0100

• changed distance calculation to use vectors
• added matrix library for calculation
• using matrix class for distance calculation
• added some stuff in libmatrix to convert to SphericalGeoCoordinates

qthcalc 0.0.5 - Tue, 24 Jun 2008 17:32:14 +0200

• code cleanups for g++ 4.3.1

qthcalc 0.0.4 - Thu, 29 May 2008 21:02:13 +0200

• exchanged order to latitude/longitude

qthcalc 0.0.3 - Mon, 30 Jan 2006 22:40:45 +0100

• a few cleanups

qthcalc 0.0.2 - Tue, 28 Oct 2003 22:53:35 +0100

• order of longitude/latitude (or latitude/longitude) on the command line can be arbitrary. longitude/latitude is distinguished by the point of compass i.e.: N, S, E or W

• license: GPL
• source package qthcalc-0.0.6.tar.gz, 397k, 2011-Dec-05
• old versions

I've prepared a debian package for this program. You can download this via
apt-get update; apt-get install qthcalc
if you configure your system to include my debian repository.