float lon = arg->getFloatValue("lon-deg", 0.0f);
float lat = arg->getFloatValue("lat-deg", 0.0f);
float alt = arg->getFloatValue("alt-ft", 0.0f);
float lon = arg->getFloatValue("lon-deg", 0.0f);
float lat = arg->getFloatValue("lat-deg", 0.0f);
float alt = arg->getFloatValue("alt-ft", 0.0f);