Add new field for geoid-ellipsoid diff

python/core/auto_generated/gps/qgsgpsconnection.sip.in

@@ -64,6 +64,8 @@ Encapsulates information relating to a GPS position fix.
 
     double elevation;
 
+    double elevation_diff;
+
     double speed;
 
 

src/app/gps/qgsgpsinformationwidget.cpp

@@ -908,6 +908,7 @@ void QgsGpsInformationWidget::displayGPSInformation( const QgsGpsInformation &in
     mTxtLatitude->setText( QString::number( info.latitude, 'f', 8 ) );
     mTxtLongitude->setText( QString::number( info.longitude, 'f', 8 ) );
     mTxtAltitude->setText( tr( "%1 m" ).arg( info.elevation, 0, 'f', 3 ) );
+    mTxtAltitudeDiff->setText( tr( "%1 m" ).arg( info.elevation_diff, 0, 'f', 3 ) );
 
     if ( mDateTimeFormat.isEmpty() )
     {

src/core/gps/qgsgpsconnection.h

@@ -128,6 +128,12 @@ class CORE_EXPORT QgsGpsInformation
      */
     double elevation = 0;
 
+    /**
+     * Geoidal separation (Diff. between WGS-84 earth ellipsoid and
+     * mean sea level.  -=geoid is below WGS-84 ellipsoid)
+     */
+    double elevation_diff = 0;
+
     /**
      * Ground speed, in km/h.
      */

src/core/gps/qgsnmeaconnection.cpp

@@ -188,6 +188,7 @@ void QgsNmeaConnection::processGgaSentence( const char *data, int len )
     mLastGPSInformation.longitude = nmea_ndeg2degree( longitude );
     mLastGPSInformation.latitude = nmea_ndeg2degree( latitude );
     mLastGPSInformation.elevation = result.elv;
+    mLastGPSInformation.elevation_diff = result.diff;
     mLastGPSInformation.quality = result.sig;
     mLastGPSInformation.satellitesUsed = result.satinuse;
   }