fgSetArchivable("/environment/pressure-inhg");
fgTie("/environment/density-slugft3", _environment,
&FGEnvironment::get_density_slugft3); // read-only
fgSetArchivable("/environment/pressure-inhg");
fgTie("/environment/density-slugft3", _environment,
&FGEnvironment::get_density_slugft3); // read-only
fgTie("/environment/wind-from-heading-deg", _environment,
&FGEnvironment::get_wind_from_heading_deg,
&FGEnvironment::set_wind_from_heading_deg);
fgTie("/environment/wind-from-heading-deg", _environment,
&FGEnvironment::get_wind_from_heading_deg,
&FGEnvironment::set_wind_from_heading_deg);