diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1ec1f627e..06f3517b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -224,6 +224,8 @@ include_directories(${PROJECT_BINARY_DIR}/src/Include)
 
 add_definitions(-DHAVE_CONFIG_H)
 
+check_function_exists(mkfifo HAVE_MKFIFO)
+
 # configure a header file to pass some of the CMake settings
 # to the source code
 configure_file (
diff --git a/src/ATC/trafficcontrol.cxx b/src/ATC/trafficcontrol.cxx
index e15f9d3c9..9a957bd53 100644
--- a/src/ATC/trafficcontrol.cxx
+++ b/src/ATC/trafficcontrol.cxx
@@ -528,7 +528,7 @@ void FGATCController::transmit(FGTrafficRecord * rec, AtcMsgId msgId,
             getName() + "-Ground";
         atisInformation =
             rec->getAircraft()->getTrafficRef()->getDepartureAirport()->
-            getDynamics()->getAtisInformation();
+            getDynamics()->getAtisSequence();
         break;
     case 4:
         receiver =
diff --git a/src/ATCDCL/atis.cxx b/src/ATCDCL/atis.cxx
index b2f358620..460cc31a8 100644
--- a/src/ATCDCL/atis.cxx
+++ b/src/ATCDCL/atis.cxx
@@ -53,6 +53,7 @@
 #include <Main/fg_props.hxx>
 #include <Main/globals.hxx>
 #include <Airports/runways.hxx>
+#include <Airports/dynamics.hxx>
 
 
 #include "ATCutils.hxx"
@@ -228,47 +229,6 @@ int Apt_US_CA(const string id) {
   return 0;
 }
 
-// Add structure and map for storing a log of atis transmissions
-// made in this session of FlightGear.  This allows the callsign
-// to be allocated correctly wrt time.
-typedef struct {
-        double tstamp;
-    int sequence;
-} atis_transmission_type;
-
-typedef std::map < std::string, atis_transmission_type > atis_log_type;
-typedef atis_log_type::iterator atis_log_iterator;
-typedef atis_log_type::const_iterator atis_log_const_iterator;
-
-static atis_log_type atislog;
-
-int FGATIS::GetAtisSequence( const string& apt_id, 
-        const double tstamp, const int interval, const int special)
-{
-    atis_transmission_type tran;
-    
-    if(atislog.find(apt_id) == atislog.end()) { // New station
-      tran.tstamp = tstamp - interval;
-// Random number between 0 and 25 inclusive, i.e. 26 equiprobable outcomes:
-      tran.sequence = int(sg_random() * LTRS);
-      atislog[apt_id] = tran;
-      //cout << "New ATIS station: " << apt_id << " seq-1: "
-      //      << tran.sequence << endl;
-    } 
-
-// calculate the appropriate identifier and update the log
-    tran = atislog[apt_id];
-
-    int delta = int((tstamp - tran.tstamp) / interval);
-    tran.tstamp += delta * interval;
-    if (special && !delta) delta++;     // a "special" ATIS update is required
-    tran.sequence = (tran.sequence + delta) % LTRS;
-    atislog[apt_id] = tran;
-    //if (delta) cout << "New ATIS sequence: " << tran.sequence
-    //      << "  Delta: " << delta << endl;
-    return(tran.sequence + (delta ? 0 : LTRS*1000));
-}
-
 // Generate the actual broadcast ATIS transmission.
 // Regen means regenerate the /current/ transmission.
 // Special means generate a new transmission, with a new sequence.
@@ -280,12 +240,12 @@ int FGATIS::GenTransmission(const int regen, const int special) {
   string BRK = ".\n";
   string PAUSE = " / ";
 
-  double tstamp = atof(fgGetString("sim/time/elapsed-sec"));
   int interval = _type == ATIS ?
         ATIS_interval   // ATIS updated hourly
       : 2*minute;	// AWOS updated more frequently
-  
-  int sequence = GetAtisSequence(ident, tstamp, interval, special);
+
+  FGAirport* apt = FGAirport::findByIdent(ident);
+  int sequence = apt->getDynamics()->updateAtisSequence(interval, special);
   if (!regen && sequence > LTRS) {
 //xx      if (msg_OK) cout << "ATIS:  no change: " << sequence << endl;
 //xx      msg_time = cur_time;
diff --git a/src/ATCDCL/atis.hxx b/src/ATCDCL/atis.hxx
index 189b11106..0c6124b8d 100644
--- a/src/ATCDCL/atis.hxx
+++ b/src/ATCDCL/atis.hxx
@@ -95,9 +95,7 @@ class FGATIS : public FGATC {
 	void TreeOut(int msgOK);
 
 	friend std::istream& operator>> ( std::istream&, FGATIS& );
-	
-	int GetAtisSequence( const std::string& apt_id, 
-        const double tstamp, const int interval, const int special);
+
 };
 
 typedef int (FGATIS::*int_getter)() const;
diff --git a/src/Airports/dynamics.cxx b/src/Airports/dynamics.cxx
index 398920f32..9cbf9f6fa 100644
--- a/src/Airports/dynamics.cxx
+++ b/src/Airports/dynamics.cxx
@@ -36,6 +36,7 @@
 #include <Main/globals.hxx>
 #include <Main/fg_props.hxx>
 #include <Airports/runways.hxx>
+#include <ATCDCL/ATCutils.hxx>
 
 #include <string>
 #include <vector>
@@ -49,33 +50,12 @@ using std::random_shuffle;
 #include "dynamics.hxx"
 
 FGAirportDynamics::FGAirportDynamics(FGAirport * ap):
-_ap(ap), rwyPrefs(ap), SIDs(ap),startupController(this) 
+    _ap(ap), rwyPrefs(ap), SIDs(ap),
+    atisSequenceIndex(-1),
+    atisSequenceTimeStamp(0.0)
+    startupController(this);
 {
     lastUpdate = 0;
-
-    // For testing only. This needs to be refined when we move ATIS functionality over.
-    atisInformation = "Sierra";
-}
-
-// Note that the ground network should also be copied
-FGAirportDynamics::
-FGAirportDynamics(const FGAirportDynamics & other):rwyPrefs(other.
-                                                            rwyPrefs),
-SIDs(other.SIDs), startupController(other.startupController)
-{
-    for (FGParkingVecConstIterator ip = other.parkings.begin();
-         ip != other.parkings.end(); ip++)
-        parkings.push_back(*(ip));
-    // rwyPrefs = other.rwyPrefs;
-    lastUpdate = other.lastUpdate;
-
-    stringVecConstIterator il;
-    for (il = other.landing.begin(); il != other.landing.end(); il++)
-        landing.push_back(*il);
-    for (il = other.takeoff.begin(); il != other.takeoff.end(); il++)
-        takeoff.push_back(*il);
-    lastUpdate = other.lastUpdate;
-    atisInformation = other.atisInformation;
 }
 
 // Destructor
@@ -567,3 +547,33 @@ FGAIFlightPlan *FGAirportDynamics::getSID(string activeRunway,
 {
     return SIDs.getBest(activeRunway, heading);
 }
+
+const std::string FGAirportDynamics::getAtisSequence()
+{
+   if (atisSequenceIndex == -1) {
+       updateAtisSequence(1, false);
+   }
+   
+   return GetPhoneticLetter(atisSequenceIndex);
+}
+
+int FGAirportDynamics::updateAtisSequence(int interval, bool forceUpdate)
+{
+    double now = globals->get_sim_time_sec();
+    if (atisSequenceIndex == -1) {
+        // first computation
+        atisSequenceTimeStamp = now;
+        atisSequenceIndex = rand() % LTRS; // random initial sequence letters
+        return atisSequenceIndex;
+    }
+
+    int steps = static_cast<int>((now - atisSequenceTimeStamp) / interval);
+    atisSequenceTimeStamp += (interval * steps);
+    if (forceUpdate && (steps == 0)) {
+        ++steps; // a "special" ATIS update is required
+    } 
+    
+    atisSequenceIndex = (atisSequenceIndex + steps) % LTRS;
+    // return a huge value if no update occurred
+    return (atisSequenceIndex + (steps ? 0 : LTRS*1000));
+}
diff --git a/src/Airports/dynamics.hxx b/src/Airports/dynamics.hxx
index 1aa61fe6f..3240f0938 100644
--- a/src/Airports/dynamics.hxx
+++ b/src/Airports/dynamics.hxx
@@ -22,24 +22,15 @@
 #ifndef _AIRPORT_DYNAMICS_HXX_
 #define _AIRPORT_DYNAMICS_HXX_
 
-
-#ifndef __cplusplus
-# error This library requires C++
-#endif
-
-#include <simgear/xml/easyxml.hxx>
-
 #include <ATC/trafficcontrol.hxx>
 #include "parking.hxx"
 #include "groundnetwork.hxx"
 #include "runwayprefs.hxx"
 #include "sidstar.hxx"
 
-//typedef vector<float> DoubleVec;
-//typedef vector<float>::iterator DoubleVecIterator;
-
+// forward decls
 class FGAirport;
-
+class FGEnvironment;
 
 class FGAirportDynamics {
 
@@ -55,7 +46,7 @@ private:
   FGApproachController approachController;
 
   time_t lastUpdate;
-  string prevTrafficType;
+  std::string prevTrafficType;
   stringVec landing;
   stringVec takeoff;
   stringVec milActive, comActive, genActive, ulActive;
@@ -67,6 +58,7 @@ private:
   intVec freqTower;    // </TOWER>
   intVec freqApproach; // </APPROACH>
 
+<<<<<<< HEAD:src/Airports/dynamics.hxx
   string atisInformation;
 
   string chooseRunwayFallback();
@@ -75,9 +67,16 @@ private:
 
     double elevation;
 
+=======
+  int atisSequenceIndex;
+  double atisSequenceTimeStamp;
+  
+  std::string chooseRunwayFallback();
+  bool innerGetActiveRunway(const std::string &trafficType, int action, std::string &runway, double heading);
+  std::string chooseRwyByHeading(stringVec rwys, double heading);
+>>>>>>> next:src/Airports/dynamics.hxx
 public:
   FGAirportDynamics(FGAirport* ap);
-  FGAirportDynamics(const FGAirportDynamics &other);
   ~FGAirportDynamics();
 
   void addAwosFreq     (int val) { freqAwos.push_back(val);      };
@@ -121,9 +120,15 @@ public:
   FGTowerController      *getTowerController()      { return &towerController; };
   FGApproachController   *getApproachController()   { return &approachController; };
 
-  const string& getAtisInformation() { return atisInformation; };
-  int getGroundFrequency (unsigned leg); //{ return freqGround.size() ? freqGround[0] : 0; };
+  int getGroundFrequency(unsigned leg);
   int getTowerFrequency  (unsigned nr);
+  
+  /// get current ATIS sequence letter
+  const std::string getAtisSequence();
+
+  /// get the current ATIS sequence number, updating it if necessary
+  int updateAtisSequence(int interval, bool forceUpdate);
+
   void setRwyUse(const FGRunwayPreference& ref);
 };
 
diff --git a/src/Airports/simple.cxx b/src/Airports/simple.cxx
index f4f3d1adb..9df1cb254 100644
--- a/src/Airports/simple.cxx
+++ b/src/Airports/simple.cxx
@@ -96,20 +96,18 @@ bool FGAirport::isHeliport() const
 
 FGAirportDynamics * FGAirport::getDynamics()
 {
-    if (_dynamics != 0) {
+    if (_dynamics) {
         return _dynamics;
-    } else {
-        //cerr << "Trying to load dynamics for " << _id << endl;
-        _dynamics = new FGAirportDynamics(this);
-        XMLLoader::load(_dynamics);
+    }
+    
+    _dynamics = new FGAirportDynamics(this);
+    XMLLoader::load(_dynamics);
 
-        FGRunwayPreference rwyPrefs(this);
-        XMLLoader::load(&rwyPrefs);
-        _dynamics->setRwyUse(rwyPrefs);
-
-        //FGSidStar SIDs(this);
-        XMLLoader::load(_dynamics->getSIDs());
-   }
+    FGRunwayPreference rwyPrefs(this);
+    XMLLoader::load(&rwyPrefs);
+    _dynamics->setRwyUse(rwyPrefs);
+    XMLLoader::load(_dynamics->getSIDs());
+    
     return _dynamics;
 }
 
diff --git a/src/Include/config_cmake.h.in b/src/Include/config_cmake.h.in
index 047717038..721253db8 100644
--- a/src/Include/config_cmake.h.in
+++ b/src/Include/config_cmake.h.in
@@ -19,6 +19,7 @@
 #cmakedefine HAVE_SYS_TIME_H
 #cmakedefine HAVE_WINDOWS_H
 #cmakedefine HAVE_CULLSETTINGS_CLEAR_MASK
+#cmakedefine HAVE_MKFIFO
 
 #define VERSION "@FLIGHTGEAR_VERSION@"
 
diff --git a/src/Main/fg_commands.cxx b/src/Main/fg_commands.cxx
index c2058ba19..f9933243d 100644
--- a/src/Main/fg_commands.cxx
+++ b/src/Main/fg_commands.cxx
@@ -34,6 +34,9 @@
 #include <Scripting/NasalSys.hxx>
 #include <Sound/sample_queue.hxx>
 #include <Airports/xmlloader.hxx>
+#include <ATC/CommStation.hxx>
+#include <Navaids/navrecord.hxx>
+#include <Navaids/navlist.hxx>
 
 #include "fg_init.hxx"
 #include "fg_io.hxx"
@@ -1349,7 +1352,63 @@ do_release_cockpit_button (const SGPropertyNode *arg)
   return true;
 }
 
+static SGGeod commandSearchPos(const SGPropertyNode* arg)
+{
+  if (arg->hasChild("longitude-deg") && arg->hasChild("latitude-deg")) {
+    return SGGeod::fromDeg(arg->getDoubleValue("longitude-deg"),
+                           arg->getDoubleValue("latitude-deg"));
+  }
+  
+  // use current viewer/aircraft position
+  return SGGeod::fromDeg(fgGetDouble("/position/longitude-deg"), 
+                         fgGetDouble("/position/latitude-deg"));
+}
+  
+static bool
+do_comm_search(const SGPropertyNode* arg)
+{
+  SGGeod pos = commandSearchPos(arg);
+  int khz = static_cast<int>(arg->getDoubleValue("frequency-mhz") * 100.0 + 0.25);
+  
+  flightgear::CommStation* sta = flightgear::CommStation::findByFreq(khz, pos, NULL);
+  if (!sta) {
+    return true;
+  }
+  
+  SGPropertyNode* result = fgGetNode(arg->getStringValue("result"));
+  sta->createBinding(result);
+  return true;
+}
 
+static bool
+do_nav_search(const SGPropertyNode* arg)
+{
+  SGGeod pos = commandSearchPos(arg);
+  double mhz = arg->getDoubleValue("frequency-mhz");
+
+  FGNavList* navList = globals->get_navlist();
+  string type(arg->getStringValue("type", "vor"));
+  if (type == "dme") {
+    navList = globals->get_dmelist();
+  } else if (type == "tacan") {
+    navList = globals->get_tacanlist();
+  }
+  
+  FGNavRecord* nav = navList->findByFreq(mhz, pos);
+  if (!nav && (type == "vor")) {
+    // if we're searching VORs, look for localizers too
+    nav = globals->get_loclist()->findByFreq(mhz, pos);
+  }
+  
+  if (!nav) {
+    return true;
+  }
+  
+  SGPropertyNode* result = fgGetNode(arg->getStringValue("result"));
+  nav->createBinding(result);
+  return true;
+}
+  
 ////////////////////////////////////////////////////////////////////////
 // Command setup.
 ////////////////////////////////////////////////////////////////////////
@@ -1421,6 +1480,10 @@ static struct {
     { "dump-terrainbranch", do_dump_terrain_branch },
     { "print-visible-scene", do_print_visible_scene_info },
     { "reload-shaders", do_reload_shaders },
+  
+    { "find-navaid", do_nav_search },
+    { "find-comm", do_comm_search },
+  
     { 0, 0 }			// zero-terminated
 };
 
diff --git a/src/Navaids/PositionedBinding.cxx b/src/Navaids/PositionedBinding.cxx
index c1ecdf0aa..8a2f23f6f 100644
--- a/src/Navaids/PositionedBinding.cxx
+++ b/src/Navaids/PositionedBinding.cxx
@@ -148,12 +148,27 @@ AirportBinding::AirportBinding(const FGAirport* apt, SGPropertyNode* nd) :
     for (unsigned int c=0; c<apt->commStations().size(); ++c) {
         flightgear::CommStation* comm = apt->commStations()[c];
         std::string tynm = FGPositioned::nameForType(comm->type());
-        int count = nd->getChildren(tynm).size();
         
-        SGPropertyNode* commNode = nd->getChild(tynm, count, true);
-        commNode->setStringValue("ident", comm->ident());
-        commNode->setDoubleValue("frequency-mhz", comm->freqMHz());
-    }
+      // for some standard frequence types, we don't care about the ident,
+      // so just list the frequencies under one group.
+        if ((comm->type() == FGPositioned::FREQ_ATIS) ||
+            (comm->type() == FGPositioned::FREQ_AWOS) ||
+            (comm->type() == FGPositioned::FREQ_TOWER) ||
+            (comm->type() == FGPositioned::FREQ_GROUND))
+        {
+          SGPropertyNode* commNode = nd->getChild(tynm, 0, true);
+          int count = nd->getChildren("frequency-mhz").size();
+          SGPropertyNode* freqNode = commNode->getChild("frequency-mhz", count, true);
+          freqNode->setDoubleValue(comm->freqMHz());
+        } else {
+      // for other kinds of frequency, there's more variation, so list the ID too
+          int count = nd->getChildren(tynm).size();
+          SGPropertyNode* commNode = nd->getChild(tynm, count, true);
+          commNode->setStringValue("ident", comm->ident());
+          commNode->setDoubleValue("frequency-mhz", comm->freqMHz());
+
+        }
+      } // of airprot comm stations iteration
 }
 
 CommStationBinding::CommStationBinding(const CommStation* sta, SGPropertyNode* node) :
diff --git a/src/Navaids/positioned.cxx b/src/Navaids/positioned.cxx
index b67e9c75d..7aa183eba 100644
--- a/src/Navaids/positioned.cxx
+++ b/src/Navaids/positioned.cxx
@@ -841,7 +841,7 @@ FGPositioned::sortByRange(List& aResult, const SGGeod& aPos)
 
 FGPositioned::Filter* createSearchFilter(const SGPropertyNode* arg)
 {
-    string sty(arg->getStringValue("type", 0));
+    string sty(arg->getStringValue("type", "any"));
     FGPositioned::Type ty = FGPositioned::typeFromName(sty);
     double minRunwayLenFt = arg->getDoubleValue("min-runway-length-ft", -1.0);
     
@@ -861,7 +861,7 @@ FGPositioned::Filter* createSearchFilter(const SGPropertyNode* arg)
     return NULL;
 }
 
-SGGeod commandSearchPos(const SGPropertyNode* arg)
+static SGGeod commandSearchPos(const SGPropertyNode* arg)
 {
     if (arg->hasChild("longitude-deg") && arg->hasChild("latitude-deg")) {
         return SGGeod::fromDeg(arg->getDoubleValue("longitude-deg"),
@@ -932,7 +932,7 @@ bool commandFindByIdent(const SGPropertyNode* arg)
     if (arg->hasChild("name")) {
         results = FGPositioned::findAllWithName(arg->getStringValue("name"), filt.get(), exact);
     } else if (arg->hasChild("ident")) {
-        results = FGPositioned::findAllWithName(arg->getStringValue("ident"), filt.get(), exact);
+        results = FGPositioned::findAllWithIdent(arg->getStringValue("ident"), filt.get(), exact);
     } else {
         SG_LOG(SG_GENERAL, SG_WARN, "commandFindByIdent: no search term defined");
         return false;
diff --git a/src/Scripting/NasalSys.cxx b/src/Scripting/NasalSys.cxx
index 2690bda6d..af67ae368 100644
--- a/src/Scripting/NasalSys.cxx
+++ b/src/Scripting/NasalSys.cxx
@@ -476,10 +476,9 @@ static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
     // Converts from 100ns units in 1601 epoch to unix epoch in sec
     return naNum((t * 1e-7) - 11644473600.0);
 #else
-    time_t t;
     struct timeval td;
-    do { t = time(0); gettimeofday(&td, 0); } while(t != time(0));
-    return naNum(t + 1e-6 * td.tv_usec);
+    gettimeofday(&td, 0);
+    return naNum(td.tv_sec + 1e-6 * td.tv_usec);
 #endif
 }