SGPropertyNode_ptr boundary_wind_speed_n;
SGPropertyNode_ptr boundary_wind_from_heading_n;
SGPropertyNode_ptr boundary_visibility_n;
SGPropertyNode_ptr boundary_sea_level_pressure_n;
SGPropertyNode_ptr boundary_wind_speed_n;
SGPropertyNode_ptr boundary_wind_from_heading_n;
SGPropertyNode_ptr boundary_visibility_n;
SGPropertyNode_ptr boundary_sea_level_pressure_n;