Latitude/longitude FileMaker Pro plug-in. LatitudeZERO brings the geographical world of latitude and longitude coordinates into FileMaker Pro with our LatitudeZERO plug-in. Use LatitudeZERO to: Calculate the distance between two ZIP codes Calculate the distance between coordinates Return results in miles, kilometers or nautical miles Determine whether coordinates are within our outside a specified radius Convert distances from one unit of measure to another Allocate Sales Reps / Agents that live within a certain radius Sort records by distance ... and more LatitudeZERO was named after latitude zero degrees, the alternative name for the equator.