sprintf( propname, "/radios/nav[%d]/heading-needle-deflection", index );
fgTie( propname, this, &FGNavCom::get_nav_heading_needle_deflection );
+ sprintf( propname, "/radios/nav[%d]/has-gs", index );
+ fgTie( propname, this, &FGNavCom::get_nav_has_gs );
+
sprintf( propname, "/radios/nav[%d]/gs-needle-deflection", index );
fgTie( propname, this, &FGNavCom::get_nav_gs_needle_deflection );