virtual SimObjectType* Exec (SimObjectType* targetList);
        virtual void Display (VirtualDisplay*);
        virtual void DisplayInit (ImageBuffer*);

        virtual void SetDesiredTarget (SimObjectType *curTarget);

        int LockTarget (void);
        int IsLocked (void)                                                     {return (hasTarget == TargetLocked);}

        void  ToggleFOV (void);
        float CurFOV (void)                                                     {return curFOV;};

        int  SetDesiredSeekerPos (float* az, float* el);

        void SetYPR (float a, float b, float c)         { yaw=a; pitch=b; roll=c; };
        void GetYPR (float* a, float* b, float* c)      { *a=yaw; *b=pitch; *c=roll; };

        void SetTargetPosition (float a, float b, float c)              { tgtX=a; tgtY=b; tgtZ=c; };
        void GetTargetPosition (float* a, float* b, float* c)   { *a=tgtX; *b=tgtY; *c=tgtZ; };

protected :
        void    DrawTerrain (void);

        int             hasTarget;
        float   curFOV;
        float   roll, pitch, yaw;
        float   tgtX, tgtY, tgtZ;
        enum {NoTarget, TargetLocked};