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diff --git a/Stars45/Contact.h b/Stars45/Contact.h
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+/*  Starshatter OpenSource Distribution
+    Copyright (c) 1997-2004, Destroyer Studios LLC.
+    All Rights Reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name "Destroyer Studios" nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+
+    SUBSYSTEM:    Stars.exe
+    FILE:         Contact.h
+    AUTHOR:       John DiCamillo
+
+
+    OVERVIEW
+    ========
+    Sensor Contact class
+*/
+
+#ifndef Contact_h
+#define Contact_h
+
+#include "Types.h"
+#include "SimObject.h"
+#include "System.h"
+#include "Geometry.h"
+
+// +--------------------------------------------------------------------+
+
+class Ship;
+class Shot;
+
+class Contact : public SimObserver
+{
+    friend class Sensor;
+
+public:
+    static const char* TYPENAME() { return "Contact"; }
+
+    Contact();
+    Contact(Ship* s, float p, float a);
+    Contact(Shot* s, float p, float a);
+    virtual ~Contact();
+
+    int operator == (const Contact& c) const;
+
+    Ship*    GetShip()   const { return ship;  }
+    Shot*    GetShot()   const { return shot;  }
+    Point    Location()  const { return loc;   }
+
+    double   PasReturn() const { return d_pas; }
+    double   ActReturn() const { return d_act; }
+    bool     PasLock()   const;
+    bool     ActLock()   const;
+    double   Age()       const;
+    bool     IsProbed()  const { return probe; }
+
+    DWORD    AcquisitionTime() const { return acquire_time; }
+
+    int      GetIFF(const Ship* observer)    const;
+    void     GetBearing(const Ship* observer, double& az, double& el, double& r) const;
+    double   Range(const Ship* observer,
+    double      limit=75e3)   const;
+
+    bool     InFront(const Ship* observer)   const;
+    bool     Threat(const Ship* observer)    const;
+    bool     Visible(const Ship* observer)   const;
+
+    void     Reset();
+    void     Merge(Contact* c);
+    void     ClearTrack();
+    void     UpdateTrack();
+    int      TrackLength()     const { return ntrack;   }
+    Point    TrackPoint(int i) const;
+
+    virtual bool         Update(SimObject* obj);
+    virtual const char*  GetObserverName() const;
+
+private:
+    Ship*    ship;
+    Shot*    shot;
+    Point    loc;
+    DWORD    acquire_time;
+    DWORD    time;
+
+    Point*   track;
+    int      ntrack;
+    DWORD    track_time;
+
+    float    d_pas;   // power output
+    float    d_act;   // mass, size
+    bool     probe;   // scanned by probe
+};
+
+#endif Contact_h
+