diff --git a/src/blackmisc/avioadfsystem.h b/src/blackmisc/avioadfsystem.h
index b2660b298..848378428 100644
--- a/src/blackmisc/avioadfsystem.h
+++ b/src/blackmisc/avioadfsystem.h
@@ -25,7 +25,7 @@ namespace BlackMisc
         using MetaType = Policy::MetaType::Default;
         using Equals = Policy::Equals::None;
         using LessThan = Policy::LessThan::None;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
diff --git a/src/blackmisc/aviocomsystem.h b/src/blackmisc/aviocomsystem.h
index 8953bf8c0..44451b840 100644
--- a/src/blackmisc/aviocomsystem.h
+++ b/src/blackmisc/aviocomsystem.h
@@ -22,7 +22,7 @@ namespace BlackMisc
     template <> struct CValueObjectStdTuplePolicy<Aviation::CComSystem> : public CValueObjectStdTuplePolicy<>
     {
         using LessThan = Policy::LessThan::None;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
diff --git a/src/blackmisc/avionavsystem.h b/src/blackmisc/avionavsystem.h
index c61788075..71c1df4f6 100644
--- a/src/blackmisc/avionavsystem.h
+++ b/src/blackmisc/avionavsystem.h
@@ -24,7 +24,7 @@ namespace BlackMisc
         using MetaType = Policy::MetaType::Default;
         using Equals = Policy::Equals::None;
         using LessThan = Policy::LessThan::None;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
diff --git a/src/blackmisc/coordinateecef.h b/src/blackmisc/coordinateecef.h
index ec1615ebe..a75700ca0 100644
--- a/src/blackmisc/coordinateecef.h
+++ b/src/blackmisc/coordinateecef.h
@@ -17,7 +17,7 @@ namespace BlackMisc
     //! \private
     template <> struct CValueObjectStdTuplePolicy<Geo::CCoordinateEcef> : public CValueObjectStdTuplePolicy<>
     {
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
diff --git a/src/blackmisc/mathmatrixbase.cpp b/src/blackmisc/mathmatrixbase.cpp
index e93db27a0..e7d739a95 100644
--- a/src/blackmisc/mathmatrixbase.cpp
+++ b/src/blackmisc/mathmatrixbase.cpp
@@ -142,16 +142,14 @@ namespace BlackMisc
         /*
          * Compare
          */
-        template <class ImplMatrix, int Rows, int Columns> int CMatrixBase<ImplMatrix, Rows, Columns>::compareImpl(const CValueObject &otherBase) const
+        template <class ImplMatrix, int Rows, int Columns> int CMatrixBase<ImplMatrix, Rows, Columns>::compareImpl(const ImplMatrix &a, const ImplMatrix &b)
         {
-            const auto &other = static_cast<const CMatrixBase &>(otherBase);
-
             for (int r = 0; r < Rows; ++r)
             {
                 for (int c = 0; c < Columns; ++c)
                 {
-                    if (this->m_matrix(r, c) < other.m_matrix(r, c)) { return -1; }
-                    if (this->m_matrix(r, c) > other.m_matrix(r, c)) { return 1; }
+                    if (a.m_matrix(r, c) < b.m_matrix(r, c)) { return -1; }
+                    if (a.m_matrix(r, c) > b.m_matrix(r, c)) { return 1; }
                 }
             }
             return 0;
diff --git a/src/blackmisc/mathmatrixbase.h b/src/blackmisc/mathmatrixbase.h
index ab0ec8a1d..b9ff5a431 100644
--- a/src/blackmisc/mathmatrixbase.h
+++ b/src/blackmisc/mathmatrixbase.h
@@ -22,7 +22,7 @@ namespace BlackMisc
     {
         using Equals = Policy::Equals::None;
         using LessThan = Policy::LessThan::None;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
@@ -36,6 +36,9 @@ namespace BlackMisc
          */
         template<class ImplMatrix, int Rows, int Columns> class CMatrixBase : public CValueObjectStdTuple<CMatrixBase<ImplMatrix, Rows, Columns>>
         {
+            //! \copydoc CValueObject::compare
+            friend int compare(const ImplMatrix &a, const ImplMatrix &b) { return compareImpl(a, b); }
+
         public:
             //! \brief Default constructor
             CMatrixBase() = default;
@@ -214,9 +217,6 @@ namespace BlackMisc
             // no bug, Qt expects columns rows
             QGenericMatrix<Columns, Rows, double> m_matrix; //!< backing data
 
-            //! \copydoc CValueObject::compareImpl
-            virtual int compareImpl(const CValueObject &other) const override;
-
             //! \copydoc CValueObject::marshallToDbus
             virtual void marshallToDbus(QDBusArgument &argument) const override;
 
@@ -241,6 +241,9 @@ namespace BlackMisc
 
             //! \brief Check range of row / column
             void checkRange(int row, int column) const;
+
+            //! Implementation of compare
+            static int compareImpl(const ImplMatrix &, const ImplMatrix &);
         };
 
     } // namespace
diff --git a/src/blackmisc/mathvector3d.h b/src/blackmisc/mathvector3d.h
index 3234036a2..2caa7f357 100644
--- a/src/blackmisc/mathvector3d.h
+++ b/src/blackmisc/mathvector3d.h
@@ -21,7 +21,7 @@ namespace BlackMisc
     //! \private
     template <> struct CValueObjectStdTuplePolicy<Math::CVector3D> : public CValueObjectStdTuplePolicy<>
     {
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
diff --git a/src/blackmisc/pqphysicalquantity.cpp b/src/blackmisc/pqphysicalquantity.cpp
index fd514523c..b1ae81b95 100644
--- a/src/blackmisc/pqphysicalquantity.cpp
+++ b/src/blackmisc/pqphysicalquantity.cpp
@@ -350,15 +350,13 @@ namespace BlackMisc
         /*
          * Compare
          */
-        template <class MU, class PQ> int CPhysicalQuantity<MU, PQ>::compareImpl(const CValueObject &otherBase) const
+        template <class MU, class PQ> int CPhysicalQuantity<MU, PQ>::compareImpl(const PQ &a, const PQ &b)
         {
-            const auto &other = static_cast<const CPhysicalQuantity &>(otherBase);
+            if (a.isNull() > b.isNull()) { return -1; }
+            if (a.isNull() < b.isNull()) { return 1; }
 
-            if (this->isNull() > other.isNull()) { return -1; }
-            if (this->isNull() < other.isNull()) { return 1; }
-
-            if (*this < other) { return -1; }
-            else if (*this > other) { return 1; }
+            if (a < b) { return -1; }
+            else if (a > b) { return 1; }
             else { return 0; }
         }
 
diff --git a/src/blackmisc/pqphysicalquantity.h b/src/blackmisc/pqphysicalquantity.h
index a8f58abf1..90d40ccb0 100644
--- a/src/blackmisc/pqphysicalquantity.h
+++ b/src/blackmisc/pqphysicalquantity.h
@@ -34,7 +34,7 @@ namespace BlackMisc
         using MetaType = Policy::MetaType::DefaultAndQList;
         using Equals = Policy::Equals::None;
         using LessThan = Policy::LessThan::None;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
@@ -47,6 +47,9 @@ namespace BlackMisc
          */
         template <class MU, class PQ> class CPhysicalQuantity : public CValueObjectStdTuple<CPhysicalQuantity<MU, PQ>>
         {
+            //! \copydoc CValueObject::compare
+            friend int compare(const PQ &a, const PQ &b) { return compareImpl(a, b); }
+
         public:
             //! Index
             enum ColumnIndex
@@ -254,9 +257,6 @@ namespace BlackMisc
             //! \copydoc CValueObject::convertToQString
             virtual QString convertToQString(bool i18n = false) const override;
 
-            //! \copydoc CValueObject::compareImpl
-            virtual int compareImpl(const CValueObject &other) const override;
-
         private:
             double m_value; //!< numeric part
             MU m_unit;      //!< unit part
@@ -264,6 +264,9 @@ namespace BlackMisc
             //! Which subclass of CMeasurementUnit is used?
             typedef MU UnitClass;
 
+            //! Implementation of compare
+            static int compareImpl(const PQ &, const PQ &);
+
             //! Easy access to derived class (CRTP template parameter)
             PQ const *derived() const { return static_cast<PQ const *>(this); }
 
diff --git a/src/blackmisc/valueobject_policy.h b/src/blackmisc/valueobject_policy.h
index 2edfc4185..07ae3d9e1 100644
--- a/src/blackmisc/valueobject_policy.h
+++ b/src/blackmisc/valueobject_policy.h
@@ -197,7 +197,7 @@ namespace BlackMisc
             {
                 //! Policy implementation of CValueObject::compareImpl
                 template <class T, class...>
-                static bool compareImpl(const T &, const T &) { qFatal("Not implemented"); return 0; }
+                static bool compareImpl(const T &, const T &) { return 0; }
             };
 
             //! CValueObjectStdTuple polymorphic comparison policy which inherits the policy of the base class
@@ -215,14 +215,6 @@ namespace BlackMisc
                 template <class T, class...>
                 static bool compareImpl(const T &a, const T &b) { return compare(Private::EncapsulationBreaker::toMetaTuple(a), Private::EncapsulationBreaker::toMetaTuple(b)); }
             };
-
-            //! CValueObjectStdTuple policy for a class which implements its own custom poylymorphic comparison support
-            struct Own
-            {
-                //! Policy implementation of CValueObject::compareImpl
-                template <class T, class...>
-                static bool compareImpl(const T &, const T &) { return 0; }
-            };
         }
 
         namespace Hash
diff --git a/src/blackmisc/variant.cpp b/src/blackmisc/variant.cpp
index 7dc53842a..7b8289033 100644
--- a/src/blackmisc/variant.cpp
+++ b/src/blackmisc/variant.cpp
@@ -35,24 +35,22 @@ namespace BlackMisc
         return m_v.toString();
     }
 
-    int CVariant::compareImpl(const CValueObject &otherBase) const
+    int CVariant::compareImpl(const CVariant &a, const CVariant &b)
     {
-        const auto &other = static_cast<const CVariant &>(otherBase);
-
-        if (userType() < other.userType()) { return -1; }
-        if (userType() > other.userType()) { return 1; }
-        auto *meta = getValueObjectMetaInfo();
-        auto *otherMeta = other.getValueObjectMetaInfo();
-        if (meta && otherMeta)
+        if (a.userType() < b.userType()) { return -1; }
+        if (a.userType() > b.userType()) { return 1; }
+        auto *aMeta = a.getValueObjectMetaInfo();
+        auto *bMeta = b.getValueObjectMetaInfo();
+        if (aMeta && bMeta)
         {
             const void *casted = nullptr;
-            if ((casted = meta->upCastTo(data(), otherMeta->getMetaTypeId())))
+            if ((casted = aMeta->upCastTo(a.data(), bMeta->getMetaTypeId())))
             {
-                return otherMeta->compare(casted, other.data());
+                return bMeta->compareImpl(casted, b.data());
             }
-            else if ((casted = otherMeta->upCastTo(other.data(), meta->getMetaTypeId())))
+            else if ((casted = bMeta->upCastTo(b.data(), aMeta->getMetaTypeId())))
             {
-                return meta->compare(data(), casted);
+                return aMeta->compareImpl(a.data(), casted);
             }
             else
             {
@@ -60,8 +58,8 @@ namespace BlackMisc
                 return 0;
             }
         }
-        if (m_v < other.m_v) { return -1; }
-        if (m_v > other.m_v) { return 1; }
+        if (a.m_v < b.m_v) { return -1; }
+        if (a.m_v > b.m_v) { return 1; }
         return 0;
     }
 
diff --git a/src/blackmisc/variant.h b/src/blackmisc/variant.h
index dc158a5ce..790bfb107 100644
--- a/src/blackmisc/variant.h
+++ b/src/blackmisc/variant.h
@@ -32,7 +32,7 @@ namespace BlackMisc
         using MetaType = Policy::MetaType::QMetaTypeAndDBusOnly;
         using Equals = Policy::Equals::OwnEquals;
         using LessThan = Policy::LessThan::OwnLessThan;
-        using Compare = Policy::Compare::Own;
+        using Compare = Policy::Compare::None;
         using Hash = Policy::Hash::Own;
         using DBus = Policy::DBus::Own;
         using Json = Policy::Json::Own;
@@ -194,8 +194,8 @@ namespace BlackMisc
         //! Less than operator.
         friend bool operator <(const CVariant &a, const CVariant &b) { return compare(a, b) < 0; }
 
-        //! \copydoc CValueObject::compareImpl
-        virtual int compareImpl(const CValueObject &other) const override;
+        //! \copydoc CValueObject::compare
+        friend int compare(const CVariant &a, const CVariant &b) { return compareImpl(a, b); }
 
         //! \copydoc CValueObject::setPropertyByIndex
         virtual void setPropertyByIndex(const CVariant &variant, const CPropertyIndex &index) override;
@@ -215,6 +215,8 @@ namespace BlackMisc
         Private::IValueObjectMetaInfo *getValueObjectMetaInfo() const { return Private::getValueObjectMetaInfo(m_v); }
         void *data() { return m_v.data(); }
         const void *data() const { return m_v.data(); }
+
+        static int compareImpl(const CVariant &, const CVariant &);
     };
 
     //! Compare stored value of CVariant with any CValueObject derived class.