Thanks to a request by Darren Bedwell of the Central Indiana Soaring
Society, I've added a new feature to the Geographic Calculators page at
GPS Visualizer: "range rings." (I don't know what the official name
for something like this would be, so I've borrowed a term that I've
seen on weather radar interfaces.)

Basically, you give it a point and a radius (or multiple radii), and it
will plot the circle, or concentric circles, on a map in the format of
your choice.

http://www.gpsvisualizer.com/calculators (3rd form down, for now)

For the center point, you can enter raw coordinates or ICAO/IATA
airport codes. (If the airport you're looking for isn't found in the
database -- which certainly may happen, especially with the small
airports used by gliders -- please let me know and I can add new
information upon request.)

I don't have this integrated smoothly with the rest of GPS Visualizer's
mapping functions yet, but: if you click "Show coordinates" instead of
the "Draw map" button, you'll get a text file of a "track" representing
the circle, and you can easily upload that to the map form along with
your other data.


If you haven't seen GPS Visualizer before, please drop by and check it
out at http://www.gpsvisualizer.com/. It's free, platform-independent,
and it supports many GPS data file formats, as well as mapping of
street addresses or raw coordinates. Output can be in the form of
SVGs, JPEGs, PNGs, Google Maps, or Google Earth KML.


Adam Schneider
adamschneider.net


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