Geoid is a free and easy to use geodesic computer for amateur radio use.

Here are some key features of "Geoid":

· Converts Lat / Lon to Maidenhead Grid Square and reverse
· Computes range in kilometers and great circle bearing between QTH and remote site specified by Lat/Lon or Maidenhead Grid Square
· Computes range in kilometers and great circle bearing between QTH and a site selected from a database list for all known callsign prefixes and their geographic position. Geographic position is by major city.