diff --git a/plugins/channelrx/demodpacket/packetdemod.cpp b/plugins/channelrx/demodpacket/packetdemod.cpp
index 242968501..068d9fb88 100644
--- a/plugins/channelrx/demodpacket/packetdemod.cpp
+++ b/plugins/channelrx/demodpacket/packetdemod.cpp
@@ -187,7 +187,7 @@ void PacketDemod::applySettings(const PacketDemodSettings& settings, bool force)
 
     QList<QString> reverseAPIKeys;
 
-    if ((settings.m_inputFrequencyOffset != settings.m_inputFrequencyOffset) || force) {
+    if ((settings.m_inputFrequencyOffset != m_settings.m_inputFrequencyOffset) || force) {
         reverseAPIKeys.append("inputFrequencyOffset");
     }
     if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth) || force) {
diff --git a/plugins/channelrx/demodpacket/packetdemodgui.cpp b/plugins/channelrx/demodpacket/packetdemodgui.cpp
index c11cdfb58..464ad61df 100644
--- a/plugins/channelrx/demodpacket/packetdemodgui.cpp
+++ b/plugins/channelrx/demodpacket/packetdemodgui.cpp
@@ -175,7 +175,6 @@ void PacketDemodGUI::packetReceived(QByteArray packet)
         QTableWidgetItem *pidItem = new QTableWidgetItem();
         QTableWidgetItem *dataASCIIItem = new QTableWidgetItem();
         QTableWidgetItem *dataHexItem = new QTableWidgetItem();
-        QTableWidgetItem *dataAPRSItem = new QTableWidgetItem();
         ui->packets->setItem(row, PACKET_COL_FROM, fromItem);
         ui->packets->setItem(row, PACKET_COL_TO, toItem);
         ui->packets->setItem(row, PACKET_COL_VIA, viaItem);
@@ -260,6 +259,7 @@ void PacketDemodGUI::on_deltaFrequency_changed(qint64 value)
 
 void PacketDemodGUI::on_mode_currentIndexChanged(int value)
 {
+    (void) value;
     QString mode = ui->mode->currentText();
     // TODO: Support 9600 FSK
 }
diff --git a/plugins/feature/aprs/aprs.cpp b/plugins/feature/aprs/aprs.cpp
index ab6a30c59..51e072f93 100644
--- a/plugins/feature/aprs/aprs.cpp
+++ b/plugins/feature/aprs/aprs.cpp
@@ -221,6 +221,8 @@ int APRS::webapiRun(bool run,
     SWGSDRangel::SWGDeviceState& response,
     QString& errorMessage)
 {
+    (void) run;
+    (void) response;
     (void) errorMessage;
     //getFeatureStateStr(*response.getState());
     //MsgStartStopIGate *msg = MsgStartStopIGate::create(run);
diff --git a/plugins/feature/aprs/aprsgui.cpp b/plugins/feature/aprs/aprsgui.cpp
index 9733dcd4b..4e7326178 100644
--- a/plugins/feature/aprs/aprsgui.cpp
+++ b/plugins/feature/aprs/aprsgui.cpp
@@ -299,7 +299,7 @@ bool APRSGUI::handleMessage(const Message& message)
                         {
                             for (int j = 0; j < 8; j++)
                                 telemetryStation->m_telemetryBitSense[j] = aprs->m_telemetryBitSense[j];
-                            telemetryStation->m_hasTelemetryBitSense;
+                            telemetryStation->m_hasTelemetryBitSense = true;
                             telemetryStation->m_telemetryProjectName = aprs->m_telemetryProjectName;
                         }
                         if (ui->stationSelect->currentText() == aprs->m_addressee)
@@ -972,6 +972,7 @@ void APRSGUI::on_stationFilter_currentIndexChanged(int index)
 
 void APRSGUI::on_stationSelect_currentIndexChanged(int index)
 {
+    (void) index;
     QString stationCallsign = ui->stationSelect->currentText();
 
     APRSStation *station = m_stations.value(stationCallsign);
@@ -1189,11 +1190,13 @@ void APRSGUI::plotWeather()
 
 void APRSGUI::on_weatherTimeSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotWeather();
 }
 
 void APRSGUI::on_weatherPlotSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotWeather();
 }
 
@@ -1399,11 +1402,13 @@ void APRSGUI::plotMotion()
 
 void APRSGUI::on_motionTimeSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotMotion();
 }
 
 void APRSGUI::on_motionPlotSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotMotion();
 }
 
@@ -1479,11 +1484,13 @@ void APRSGUI::plotTelemetry()
 
 void APRSGUI::on_telemetryTimeSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotTelemetry();
 }
 
 void APRSGUI::on_telemetryPlotSelect_currentIndexChanged(int index)
 {
+    (void) index;
     plotTelemetry();
 }
 
diff --git a/plugins/feature/map/map.cpp b/plugins/feature/map/map.cpp
index 0b71366e2..91558ccad 100644
--- a/plugins/feature/map/map.cpp
+++ b/plugins/feature/map/map.cpp
@@ -159,6 +159,7 @@ int Map::webapiRun(bool run,
     SWGSDRangel::SWGDeviceState& response,
     QString& errorMessage)
 {
+    (void) run;
     (void) errorMessage;
     getFeatureStateStr(*response.getState());
     return 202;
diff --git a/plugins/feature/startracker/startrackergui.cpp b/plugins/feature/startracker/startrackergui.cpp
index 460ae2643..8686cc4c0 100644
--- a/plugins/feature/startracker/startrackergui.cpp
+++ b/plugins/feature/startracker/startrackergui.cpp
@@ -456,6 +456,7 @@ void StarTrackerGUI::applySettings(bool force)
 
 void StarTrackerGUI::on_useMyPosition_clicked(bool checked)
 {
+    (void) checked;
     double stationLatitude = MainCore::instance()->getSettings().getLatitude();
     double stationLongitude = MainCore::instance()->getSettings().getLongitude();
     double stationAltitude = MainCore::instance()->getSettings().getAltitude();
@@ -495,6 +496,7 @@ void StarTrackerGUI::on_dateTimeSelect_currentTextChanged(const QString &text)
 
 void StarTrackerGUI::on_dateTime_dateTimeChanged(const QDateTime &datetime)
 {
+    (void) datetime;
     if (ui->dateTimeSelect->currentIndex() == 1)
     {
         m_settings.m_dateTime = ui->dateTime->dateTime().toString(Qt::ISODateWithMs);
diff --git a/plugins/feature/startracker/startrackersettingsdialog.cpp b/plugins/feature/startracker/startrackersettingsdialog.cpp
index 5cd7a127c..f5dd6cbcd 100644
--- a/plugins/feature/startracker/startrackersettingsdialog.cpp
+++ b/plugins/feature/startracker/startrackersettingsdialog.cpp
@@ -21,8 +21,8 @@
 StarTrackerSettingsDialog::StarTrackerSettingsDialog(StarTrackerSettings *settings,
         QWidget* parent) :
     QDialog(parent),
-    ui(new Ui::StarTrackerSettingsDialog),
-    m_settings(settings)
+    m_settings(settings),
+    ui(new Ui::StarTrackerSettingsDialog)
 {
     ui->setupUi(this);
     ui->epoch->setCurrentIndex(settings->m_jnow ? 1 : 0);
diff --git a/sdrbase/feature/featurewebapiutils.cpp b/sdrbase/feature/featurewebapiutils.cpp
index 33c07ee44..ec8e09bd7 100644
--- a/sdrbase/feature/featurewebapiutils.cpp
+++ b/sdrbase/feature/featurewebapiutils.cpp
@@ -42,7 +42,7 @@ bool FeatureWebAPIUtils::mapFind(const QString& target, int featureSetIndex, int
         int httpRC = feature->webapiActionsPost(featureActionKeys, query, errorMessage);
         if (httpRC/100 != 2)
         {
-            qWarning("FeatureWebAPIUtils::mapFind: error %d: %s", httpRC, errorMessage);
+            qWarning() << "FeatureWebAPIUtils::mapFind: error " << httpRC << ":" << errorMessage;
             return false;
         }
 
@@ -65,7 +65,7 @@ Feature* FeatureWebAPIUtils::getFeature(int featureSetIndex, int featureIndex, c
     if (featureSetIndex != -1)
     {
         // Find feature with specific index
-        if (featureSetIndex < featureSets.size())
+        if (featureSetIndex < (int)featureSets.size())
         {
             featureSet = featureSets[featureSetIndex];
             if (featureIndex < featureSet->getNumberOfFeatures())
diff --git a/sdrbase/maincore.h b/sdrbase/maincore.h
index 1de9ecd46..1fc77834d 100644
--- a/sdrbase/maincore.h
+++ b/sdrbase/maincore.h
@@ -22,6 +22,7 @@
 
 #include <QMap>
 #include <QTimer>
+#include <QDateTime>
 
 #include "export.h"
 #include "settings/mainsettings.h"
diff --git a/sdrbase/util/aprs.cpp b/sdrbase/util/aprs.cpp
index 634e91b16..ee2029e13 100644
--- a/sdrbase/util/aprs.cpp
+++ b/sdrbase/util/aprs.cpp
@@ -47,7 +47,6 @@ bool APRSPacket::decode(AX25Packet packet)
 
             // First byte of information field is data type ID
             char dataType = packet.m_dataASCII[0].toLatin1();
-            bool timestamp = false;
             int idx = 1;
             switch (dataType)
             {
@@ -914,7 +913,6 @@ bool APRSPacket::parseMessage(QString& info, int& idx)
     }
     else if (m_message.startsWith("BITS."))
     {
-        bool done = false;
         QString s("");
         int i = 5;
         for (int j = 0; j < 8; j++)
diff --git a/sdrbase/util/astronomy.cpp b/sdrbase/util/astronomy.cpp
index 76544449b..c09b3103c 100644
--- a/sdrbase/util/astronomy.cpp
+++ b/sdrbase/util/astronomy.cpp
@@ -287,11 +287,7 @@ void Astronomy::moonPosition(AzAlt& aa, RADec& rd, double latitude, double longi
     double ecl = Units::degreesToRadians(23.4393 - 3.563E-7 * d); // Obliquity of the ecliptic - tilt of Earth's axis of rotation
 
     // Orbital elements for the Sun
-    double Ns = 0.0;
-    double is = 0.0;
     double ws = Units::degreesToRadians(282.9404 + 4.70935E-5 * d);
-    double as = 1.0;                                                       //  (AU)
-    double es = 0.016709 - 1.151E-9 * d;   // ecs
     double Ms = Units::degreesToRadians(356.0470 + 0.9856002585 * d);
 
     // Orbital elements for the Moon
@@ -416,7 +412,7 @@ double Astronomy::refractionSaemundsson(double alt, double pressure, double temp
 {
     double pt = (pressure/1010.0) * (283.0/(273.0+temperature));
 
-    return (1.02 / tan(Units::degreesToRadians(alt+10.3/(alt+5.11))) + 0.0019279) / 60.0;
+    return pt * (1.02 / tan(Units::degreesToRadians(alt+10.3/(alt+5.11))) + 0.0019279) / 60.0;
 }
 
 // Calculated adjustment to altitude angle from true to apparent due to atmospheric refraction using
diff --git a/sdrbase/util/ax25.cpp b/sdrbase/util/ax25.cpp
index 6d562d8e2..9fdfbccb6 100644
--- a/sdrbase/util/ax25.cpp
+++ b/sdrbase/util/ax25.cpp
@@ -39,11 +39,11 @@ bool AX25Packet::decode(QByteArray packet)
     // Address - ASCII shifted right one bit
     for (i = 0; i < 6; i++)
         destAddress[i] = (packet[i] >> 1) & 0x7f;
-    destAddress[6] = NULL;
+    destAddress[6] = '\0';
     destSSID = packet[6];
     for (i = 0; i < 6; i++)
         sourceAddress[i] = (packet[7+i] >> 1) & 0x7f;
-    sourceAddress[6] = NULL;
+    sourceAddress[6] = '\0';
     sourceSSID = packet[13];
 
     // From = source address
@@ -66,7 +66,7 @@ bool AX25Packet::decode(QByteArray packet)
         i++;
         for (j = 0; j < 6; j++)
             repeaterAddress[j] = (packet[i+j] >> 1) & 0x7f;
-        repeaterAddress[j] = NULL;
+        repeaterAddress[j] = '\0';
         i += 6;
         repeaterSSID = packet[i];
         ssid = (repeaterSSID >> 1) & 0xf;
diff --git a/sdrbase/util/maidenhead.cpp b/sdrbase/util/maidenhead.cpp
index d7c6eab5d..7cdda6957 100644
--- a/sdrbase/util/maidenhead.cpp
+++ b/sdrbase/util/maidenhead.cpp
@@ -17,6 +17,8 @@
 // along with this program. If not, see <http://www.gnu.org/licenses/>.          //
 ///////////////////////////////////////////////////////////////////////////////////
 
+#include <cmath>
+
 #include <QRegExp>
 
 #include "maidenhead.h"