+ if (!isTied) {
+ isTied = true;
+ fgTie("/steam/airspeed-kt", FGSteam::get_ASI_kias);
+ fgSetArchivable("/steam/airspeed-kt");
+ fgTie("/steam/altitude-ft", FGSteam::get_ALT_ft);
+ fgSetArchivable("/steam/altitude-ft");
+ fgTie("/steam/altimeter-datum-mb",
+ FGSteam::get_ALT_datum_mb, FGSteam::set_ALT_datum_mb,
+ false); /* don't modify the value */
+ fgSetArchivable("/steam/altimeter-datum-mb");
+ fgTie("/steam/turn-rate", FGSteam::get_TC_std);
+ fgSetArchivable("/steam/turn-rate");
+ fgTie("/steam/slip-skid", FGSteam::get_TC_rad);
+ fgSetArchivable("/steam/slip-skid");
+ fgTie("/steam/vertical-speed-fpm", FGSteam::get_VSI_fps);
+ fgSetArchivable("/steam/vertical-speed-fpm");
+ fgTie("/steam/gyro-compass-deg", FGSteam::get_DG_deg);
+ fgSetArchivable("/steam/gyro-compass-deg");
+ fgTie("/steam/adf-deg", FGSteam::get_HackADF_deg);
+ fgSetArchivable("/steam/adf-deg");
+ fgTie("/steam/gyro-compass-error-deg",
+ FGSteam::get_DG_err, FGSteam::set_DG_err,
+ false); /* don't modify the value */
+ fgSetArchivable("/steam/gyro-compass-error-deg");
+ fgTie("/steam/mag-compass-deg", FGSteam::get_MH_deg);
+ fgSetArchivable("/steam/mag-compass-deg");
+ }
+ _UpdatesPending += timesteps;