#ifndef __INSTRUMENTS_GPS_HXX
#define __INSTRUMENTS_GPS_HXX 1
+#include <cassert>
+
#include <simgear/props/props.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
#include <simgear/math/SGMath.hxx>
SGPropertyNode_ptr _realismSimpleGps; ///< should the GPS be simple or realistic?
// autopilot drive properties
+ SGPropertyNode_ptr _apDrivingFlag;
SGPropertyNode_ptr _apTrueHeading;
SGPropertyNode_ptr _apTargetAltitudeFt;
SGPropertyNode_ptr _apAltitudeLock;