props->tie("controls/start-pos-long-deg",
SGRawValueMethods<SGGeod,double>(pos, &SGGeod::getLongitudeDeg));
props->tie("controls/mp-control",
props->tie("controls/start-pos-long-deg",
SGRawValueMethods<SGGeod,double>(pos, &SGGeod::getLongitudeDeg));
props->tie("controls/mp-control",