also set new target altitude if wp is appended to empty list

diff --git a/src/Autopilot/route_mgr.cxx b/src/Autopilot/route_mgr.cxx
index 302d363deb99db76320bef7cbde0cd932ca27924..915f9de2f73e460b8292c0061de1d1f5df692e7a 100644 (file)
--- a/src/Autopilot/route_mgr.cxx
+++ b/src/Autopilot/route_mgr.cxx
@@ -229,7 +229,7 @@ void FGRouteMgr::update( double dt ) {
 
 
 void FGRouteMgr::add_waypoint( const SGWayPoint& wp, int n ) {
-    if ( n == 0 )
+    if ( n == 0 || !route->size())
         altitude_set = false;
 
     route->add_waypoint( wp, n );