diff --git a/samples/blackmiscvectorgeo/samplesvectormatrix.cpp b/samples/blackmiscvectorgeo/samplesvectormatrix.cpp
index cee116495..3408f8d54 100644
--- a/samples/blackmiscvectorgeo/samplesvectormatrix.cpp
+++ b/samples/blackmiscvectorgeo/samplesvectormatrix.cpp
@@ -18,9 +18,10 @@ int BlackMiscTest::CSamplesVectorMatrix::samples()
     CMatrix3x3 mr = m;
     qDebug() << m << mr;
     mr.setRandom();
-    CMatrix3x3 mi = mr.inverse();
+    bool im;
+    CMatrix3x3 mi = mr.inverse(im);
     CMatrix3x3 mid = mr * mi;
-    qDebug() << mr << mi << mid;
+    qDebug() << mr << mi << mid << im;
 
     // bye
     qDebug() << "-----------------------------------------------";
diff --git a/src/blackmisc/coordinatetransformation.cpp b/src/blackmisc/coordinatetransformation.cpp
index 113c5b425..d41b15e71 100644
--- a/src/blackmisc/coordinatetransformation.cpp
+++ b/src/blackmisc/coordinatetransformation.cpp
@@ -51,8 +51,10 @@ CCoordinateEcef CCoordinateTransformation::toEcef(const CCoordinateNed &ned)
 
     dcm = dcm1 * dcm2 * dcm3;
 
+    bool inverse;
     invDcm.setZero();
-    invDcm = dcm.inverse();
+    invDcm = dcm.inverse(inverse);
+    Q_ASSERT_X(inverse, "toEcef", "Inverse matrix could not be calculated");
 
     CVector3D tempResult = invDcm * ned.toMathVector(); // to generic vector
     CCoordinateEcef result(tempResult);
diff --git a/src/blackmisc/mathmatrix1x3.h b/src/blackmisc/mathmatrix1x3.h
index 53694d32e..6a90a32ac 100644
--- a/src/blackmisc/mathmatrix1x3.h
+++ b/src/blackmisc/mathmatrix1x3.h
@@ -25,18 +25,18 @@ public:
      */
     CMatrix1x3() : CMatrixBase() {}
 
-    /*!
-     * \brief init with value
-     * \param fillValue
-     */
-    CMatrix1x3(double fillValue) : CMatrixBase(fillValue) {}
-
     /*!
      * \brief Copy constructor
      * \param other
      */
     CMatrix1x3(const CMatrix1x3 &otherMatrix) : CMatrixBase(otherMatrix) {}
 
+    /*!
+     * \brief Init by fill value
+     * \param fillValue
+     */
+    explicit CMatrix1x3(double fillValue) : CMatrixBase(fillValue) {}
+
     /*!
      * \brief CMatrix 3x1
      * \param c1
diff --git a/src/blackmisc/mathmatrix3x1.h b/src/blackmisc/mathmatrix3x1.h
index 405514d2b..eec8fd622 100644
--- a/src/blackmisc/mathmatrix3x1.h
+++ b/src/blackmisc/mathmatrix3x1.h
@@ -40,18 +40,18 @@ public:
         this->m_matrix(2, 0) = r3;
     }
 
-    /*!
-     * \brief init with value
-     * \param fillValue
-     */
-    CMatrix3x1(qreal fillValue) : CMatrixBase(fillValue) {}
-
     /*!
      * \brief Copy constructor
      * \param other
      */
     CMatrix3x1(const CMatrix3x1 &otherMatrix) : CMatrixBase(otherMatrix) {}
 
+    /*!
+     * \brief Init by fill value
+     * \param fillValue
+     */
+    explicit CMatrix3x1(double fillValue) : CMatrixBase(fillValue) {}
+
     /*!
      * \brief Convert to vector
      * \return
diff --git a/src/blackmisc/mathmatrix3x3.cpp b/src/blackmisc/mathmatrix3x3.cpp
index d3e51f3d4..a754f1b8a 100644
--- a/src/blackmisc/mathmatrix3x3.cpp
+++ b/src/blackmisc/mathmatrix3x3.cpp
@@ -13,9 +13,9 @@ namespace Math
 /*
  * Determinant
  */
-qreal CMatrix3x3::determinant() const
+double CMatrix3x3::determinant() const
 {
-    qreal determinant =
+    double determinant =
         this->m_matrix(0, 0) * this->m_matrix(1, 1) * this->m_matrix(2, 2) +
         this->m_matrix(0, 1) * this->m_matrix(1, 2) * this->m_matrix(2, 0) +
         this->m_matrix(0, 2) * this->m_matrix(1, 0) * this->m_matrix(2, 1) -
@@ -27,17 +27,19 @@ qreal CMatrix3x3::determinant() const
 }
 
 /*
- * Determinant
+ * Inverse
  */
-CMatrix3x3 CMatrix3x3::inverse() const
+CMatrix3x3 CMatrix3x3::inverse(bool &invertible) const
 {
     CMatrix3x3 inverse;
-    qreal det = determinant();
-
-    // should we throw an assert / error here?
-    if (det == 0) return inverse;
-
-    qreal invdet = 1.0 / det;
+    double det;
+    if (this->allValuesEqual() || (det = determinant()) == 0)
+    {
+        invertible = false;
+        inverse.setZero();
+        return inverse;
+    }
+    double invdet = 1.0 / det;
 
     inverse.m_matrix(0, 0) = (this->m_matrix(1, 1) * this->m_matrix(2, 2) - this->m_matrix(1, 2) * this->m_matrix(2, 1)) * invdet;
     inverse.m_matrix(0, 1) = (- this->m_matrix(0, 1) * this->m_matrix(2, 2) + this->m_matrix(0, 2) * this->m_matrix(2, 1)) * invdet;
@@ -49,6 +51,7 @@ CMatrix3x3 CMatrix3x3::inverse() const
     inverse.m_matrix(2, 1) = (- this->m_matrix(0, 0) * this->m_matrix(2, 1) + this->m_matrix(0, 1) * this->m_matrix(2, 0)) * invdet;
     inverse.m_matrix(2, 2) = (this->m_matrix(0, 0) * this->m_matrix(1, 1) - this->m_matrix(0, 1) * this->m_matrix(1, 0)) * invdet;
 
+    invertible = true;
     return inverse;
 }
 
diff --git a/src/blackmisc/mathmatrix3x3.h b/src/blackmisc/mathmatrix3x3.h
index 7fb438049..57fef0079 100644
--- a/src/blackmisc/mathmatrix3x3.h
+++ b/src/blackmisc/mathmatrix3x3.h
@@ -24,18 +24,45 @@ public:
      */
     CMatrix3x3() : CMatrixBase() {}
 
-    /*!
-     * \brief init with value
-     * \param fillValue
-     */
-    CMatrix3x3(double fillValue) : CMatrixBase(fillValue) {}
-
     /*!
      * \brief Copy constructor
      * \param other
      */
     CMatrix3x3(const CMatrix3x3 &otherMatrix) : CMatrixBase(otherMatrix) {}
 
+    /*!
+     * \brief Init by fill value
+     * \param fillValue
+     */
+    explicit CMatrix3x3(double fillValue) : CMatrixBase(fillValue) {}
+
+    /*!
+     * \brief Stupid but handy constructor
+     * \param r1c1
+     * \param r1c2
+     * \param r1c3
+     * \param r2c1
+     * \param r2c2
+     * \param r2c3
+     * \param r3c1
+     * \param r3c2
+     * \param r3c3
+     */
+    explicit CMatrix3x3(double r1c1, double r1c2, double r1c3,
+                        double r2c1, double r2c2, double r2c3,
+                        double r3c1, double r3c2, double r3c3) : CMatrixBase()
+    {
+        this->setElement(0, 0, r1c1);
+        this->setElement(0, 1, r1c2);
+        this->setElement(0, 2, r1c3);
+        this->setElement(1, 0, r2c1);
+        this->setElement(1, 1, r2c2);
+        this->setElement(1, 2, r2c3);
+        this->setElement(2, 0, r3c1);
+        this->setElement(2, 1, r3c2);
+        this->setElement(2, 2, r3c3);
+    }
+
     /*!
      * \brief Calculates the determinant of the matrix
      * \return
@@ -44,9 +71,10 @@ public:
 
     /*!
      * \brief Calculate the inverse
+     * \param invertible
      * \return
      */
-    CMatrix3x3 inverse() const;
+    CMatrix3x3 inverse(bool &invertible) const;
 
     /*!
      * \brief Operator *=
@@ -78,7 +106,7 @@ public:
      */
     CMatrix3x3 operator *(const CMatrix3x3 &otherMatrix) const
     {
-        CMatrix3x3 m(otherMatrix);
+        CMatrix3x3 m(*this);
         m *= otherMatrix;
         return m;
     }
@@ -95,13 +123,36 @@ public:
         return v;
     }
 
+    /*!
+     * \brief Multiply with factor
+     * \param factor
+     * \return
+     */
+    CMatrix3x3 operator *(double factor) const
+    {
+        CMatrix3x3 m(*this);
+        m *= factor;
+        return m;
+    }
+
+    /*!
+     * \brief Multiply with factor
+     * \param factor
+     * \return
+     */
+    CMatrix3x3 &operator *=(double factor)
+    {
+        CMatrixBase::operator *=(factor);
+        return (*this);
+    }
+
     /*!
      * \brief Transposed matrix
      * \return
      */
     CMatrix3x3 transposed() const
     {
-        CMatrix3x3 m(0.0);
+        CMatrix3x3 m(0);
         m.m_matrix = this->m_matrix.transposed();
         return m;
     }
@@ -126,4 +177,4 @@ public:
 
 } // namespace
 
-#endif // BLACKMISC_POSMATRIX3X3_H
+#endif // guard
diff --git a/src/blackmisc/mathmatrixbase.cpp b/src/blackmisc/mathmatrixbase.cpp
index df0fa3012..44fa3e547 100644
--- a/src/blackmisc/mathmatrixbase.cpp
+++ b/src/blackmisc/mathmatrixbase.cpp
@@ -68,6 +68,23 @@ template<class ImplMatrix, int Rows, int Columns> bool CMatrixBase<ImplMatrix, R
     return true;
 }
 
+/*
+ * All values zero?
+ */
+template<class ImplMatrix, int Rows, int Columns> bool CMatrixBase<ImplMatrix, Rows, Columns>::allValuesEqual() const
+{
+    double v = this->getElement(0,0);
+    for (int r = 0; r < Rows; r++)
+    {
+        for (int c = 0; c < Columns; c++)
+        {
+            if (this->m_matrix(r, c) != v) return false;
+        }
+    }
+    return true;
+}
+
+
 /*
  * Convert to string
  */
diff --git a/src/blackmisc/mathmatrixbase.h b/src/blackmisc/mathmatrixbase.h
index 0fffb1e4d..ee1ecc310 100644
--- a/src/blackmisc/mathmatrixbase.h
+++ b/src/blackmisc/mathmatrixbase.h
@@ -37,18 +37,21 @@ public:
      */
     CMatrixBase() : m_matrix() {}
 
-    /*!
-     * \brief Constructor with init value
-     * \param fillValue
-     */
-    CMatrixBase(double fillValue) : m_matrix() { this->m_matrix.fill(fillValue);}
-
     /*!
      * \brief Copy constructor
      * \param other
      */
     CMatrixBase(const CMatrixBase &otherMatrix) : m_matrix(otherMatrix.m_matrix) {}
 
+    /*!
+     * \brief Fill with value
+     * \param fillValue
+     */
+    explicit CMatrixBase(double fillValue) : m_matrix()
+    {
+        this->fill(fillValue);
+    }
+
     /*!
      * \brief Virtual destructor
      */
@@ -104,9 +107,9 @@ public:
      * \param factor
      * \return
      */
-    CMatrixBase &operator *(double factor)
+    ImplMatrix operator *(double factor) const
     {
-        ImplMatrix m(0.0);
+        ImplMatrix m(0);
         m += (*this);
         m *= factor;
         return m;
@@ -135,9 +138,9 @@ public:
      * \param factor
      * \return
      */
-    CMatrixBase &operator /(double factor)
+    ImplMatrix operator /(double factor) const
     {
-        ImplMatrix m(0.0);
+        ImplMatrix m(0);
         m += (*this);
         m /= factor;
         return m;
@@ -161,7 +164,7 @@ public:
      */
     ImplMatrix operator +(const ImplMatrix &otherMatrix) const
     {
-        ImplMatrix m(0.0);
+        ImplMatrix m(0);
         m += (*this);
         m += otherMatrix;
         return m;
@@ -185,7 +188,7 @@ public:
      */
     ImplMatrix operator -(const ImplMatrix &otherMatrix) const
     {
-        ImplMatrix m(0.0);
+        ImplMatrix m(0);
         m += (*this);
         m -= otherMatrix;
         return m;
@@ -220,11 +223,17 @@ public:
     void setZero() { this->m_matrix.fill(0.0); }
 
     /*!
-     * \brief isZero
+     * \brief Is zero
      * \return
      */
     bool isZero() const;
 
+    /*!
+     * \brief All values equal, if so matirx is not invertible
+     * \return
+     */
+    bool allValuesEqual() const;
+
     /*!
      * \brief Set a dedicated value
      * \param value
diff --git a/src/blackmisc/mathvector3d.h b/src/blackmisc/mathvector3d.h
index 00ae8d8c2..116c7f806 100644
--- a/src/blackmisc/mathvector3d.h
+++ b/src/blackmisc/mathvector3d.h
@@ -31,7 +31,7 @@ public:
      * \brief Constructor by value
      * \param value
      */
-    CVector3D(double value) : CVector3DBase(value) {}
+    explicit CVector3D(double value) : CVector3DBase(value) {}
 
     /*!
      * \brief Copy constructor
diff --git a/src/blackmisc/mathvector3dbase.h b/src/blackmisc/mathvector3dbase.h
index dd93c2c14..bcf1c40d1 100644
--- a/src/blackmisc/mathvector3dbase.h
+++ b/src/blackmisc/mathvector3dbase.h
@@ -46,7 +46,7 @@ protected:
      * \brief Constructor by value
      * \param value
      */
-    CVector3DBase(double value) : m_i(value), m_j(value), m_k(value) {}
+    explicit CVector3DBase(double value) : m_i(value), m_j(value), m_k(value) {}
 
     /*!
      * \brief Copy constructor
@@ -225,6 +225,58 @@ public:
         return v;
     }
 
+    /*!
+     * \brief Multiply with scalar
+     * \param factor
+     * \return
+     */
+    CVector3DBase &operator *=(double factor)
+    {
+        this->m_i *= factor;
+        this->m_j *= factor;
+        this->m_k *= factor;
+        return (*this);
+    }
+
+    /*!
+     * \brief Multiply with scalar
+     * \param factor
+     * \return
+     */
+    ImplClass operator *(double factor) const
+    {
+        ImplClass v;
+        v += (*this);
+        v *= factor;
+        return v;
+    }
+
+    /*!
+     * \brief Divide by scalar
+     * \param divisor
+     * \return
+     */
+    CVector3DBase &operator /=(double divisor)
+    {
+        this->m_i /= divisor;
+        this->m_j /= divisor;
+        this->m_k /= divisor;
+        return (*this);
+    }
+
+    /*!
+     * \brief Divide by scalar
+     * \param divisor
+     * \return
+     */
+    ImplClass operator /(double divisor) const
+    {
+        ImplClass v;
+        v += (*this);
+        v /= divisor;
+        return v;
+    }
+
     /*!
      * \brief Operator /=, just x/x, y/y, z/z
      * \param otherVector
diff --git a/tests/blackmisc/test_blackmisc.pro b/tests/blackmisc/test_blackmisc.pro
index 74a17a3d9..041388c09 100644
--- a/tests/blackmisc/test_blackmisc.pro
+++ b/tests/blackmisc/test_blackmisc.pro
@@ -11,13 +11,13 @@ INCLUDEPATH += . ../../src
 SOURCES += main.cpp testmain.cpp \
     testphysicalquantitiesbase.cpp \
     testaviationbase.cpp \
-    testvectormatrix.cpp
+    testvectormatrixbase.cpp
 
 HEADERS += testmain.h \
     testphysicalquantitiesbase.h \
     blackmisctest.h \
     testaviationbase.h \
-    testvectormatrix.h
+    testvectormatrixbase.h
 
 win32-msvc* {
     PRE_TARGETDEPS +=  ../../lib/blackmisc.lib
diff --git a/tests/blackmisc/testmain.cpp b/tests/blackmisc/testmain.cpp
index e8e070df7..a4d0859d5 100644
--- a/tests/blackmisc/testmain.cpp
+++ b/tests/blackmisc/testmain.cpp
@@ -16,7 +16,7 @@ int CTestMain::unitMain(int argc, char *argv[])
     {
         CTestPhysicalQuantitiesBase pqBaseTests ;
         CTestAviationBase avBaseTests;
-        CTestVectorMatrix vmTests;
+        CTestVectorMatrixBase vmTests;
         status |= QTest::qExec(&pqBaseTests, argc, argv);
         status |= QTest::qExec(&avBaseTests, argc, argv);
         status |= QTest::qExec(&vmTests, argc, argv);
diff --git a/tests/blackmisc/testmain.h b/tests/blackmisc/testmain.h
index 4ce4681e0..259799c55 100644
--- a/tests/blackmisc/testmain.h
+++ b/tests/blackmisc/testmain.h
@@ -8,7 +8,7 @@
 
 #include "testphysicalquantitiesbase.h"
 #include "testaviationbase.h"
-#include "testvectormatrix.h"
+#include "testvectormatrixbase.h"
 #include <QtTest/QtTest>
 
 namespace BlackMiscTest
diff --git a/tests/blackmisc/testvectormatrix.cpp b/tests/blackmisc/testvectormatrix.cpp
deleted file mode 100644
index 7036c501e..000000000
--- a/tests/blackmisc/testvectormatrix.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-/*  Copyright (C) 2013 VATSIM Community / contributors
- *  This Source Code Form is subject to the terms of the Mozilla Public
- *  License, v. 2.0. If a copy of the MPL was not distributed with this
- *  file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "testvectormatrix.h"
-
-using namespace BlackMisc::Math;
-
-namespace BlackMiscTest
-{
-
-/*
- * Basic tests vector
- */
-void CTestVectorMatrix::vectorBasics()
-{
-
-}
-
-/*
- * Matrix tests
- */
-void CTestVectorMatrix::matrixBasics()
-{
-    CMatrix3x3 m1;
-    CMatrix3x3 m2 = m1 - m1;
-    QVERIFY2(m1.isIdentity(), "Default matrix should be identity");
-    QVERIFY2(m2.isZero(), "Matrix should be zero");
-}
-
-} // namespace
-
-#include "testvectormatrix.h"
-
diff --git a/tests/blackmisc/testvectormatrixbase.cpp b/tests/blackmisc/testvectormatrixbase.cpp
new file mode 100644
index 000000000..144edac3e
--- /dev/null
+++ b/tests/blackmisc/testvectormatrixbase.cpp
@@ -0,0 +1,64 @@
+/*  Copyright (C) 2013 VATSIM Community / contributors
+ *  This Source Code Form is subject to the terms of the Mozilla Public
+ *  License, v. 2.0. If a copy of the MPL was not distributed with this
+ *  file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "testvectormatrixbase.h"
+
+using namespace BlackMisc::Math;
+
+namespace BlackMiscTest
+{
+
+/*
+ * Basic tests vector
+ */
+void CTestVectorMatrixBase::vectorBasics()
+{
+    CVector3D v1(1);
+    v1 *= 2.0;
+    CVector3D v2(2);
+    QVERIFY2(v1 == v2, "Matrix should be zero");
+}
+
+/*
+ * Matrix tests
+ * http://www.bluebit.gr/matrix-calculator/
+ */
+void CTestVectorMatrixBase::matrixBasics()
+{
+    CMatrix3x3 m1;
+    CMatrix3x3 m2 = m1 - m1;
+    QVERIFY2(m1.isIdentity(), "Default matrix should be identity");
+    QVERIFY2(m2.isZero(), "Matrix should be zero");
+
+    bool invertible;
+    CMatrix3x3 mr;
+    CMatrix3x3 msame(3.0);
+    mr = msame.inverse(invertible);
+    QVERIFY2(!invertible, "Matrix with sigular values cannot be inverted");
+
+    mr.setToIdentity();
+    QVERIFY2(mr.determinant() == 1, "Identity matrix should have determinant 1");
+    mr = mr.inverse(invertible);
+    QVERIFY2(invertible && mr.isIdentity() == 1, "Identity matrix should have inverse identity");
+
+    m1.setToIdentity();
+    m2 = m1 + m1;
+    m1 = m1 * 2.0;
+    QVERIFY2(m1 == m2, "2* Identity should be Identity + Identity");
+
+    m1 /= 2.0;
+    m2 -= m1;
+    QVERIFY2(m1 == m2, "Identity should be Identity");
+
+    m1 = CMatrix3x3(1, 5, 3, 2, 4, 7, 4, 6, 2);
+    double det = m1.determinant();
+    QVERIFY2(det == 74, qPrintable(QString("Determinant should be 74, but is: %1").arg(det)));
+    QVERIFY2(m1(0, 0) == 1 && m1(1, 0) == 2 && m1(0, 2) == 3, "Index error");
+    CMatrix3x3 mi = m1.inverse(invertible);
+    CMatrix3x3 mid = m1 * mi;
+    QVERIFY2(mid.isIdentity(), qPrintable(QString("Multiply with inverse should be identity: %1").arg(mid)));
+}
+
+} // namespace
diff --git a/tests/blackmisc/testvectormatrix.h b/tests/blackmisc/testvectormatrixbase.h
similarity index 86%
rename from tests/blackmisc/testvectormatrix.h
rename to tests/blackmisc/testvectormatrixbase.h
index f88ed7ce2..f0080328e 100644
--- a/tests/blackmisc/testvectormatrix.h
+++ b/tests/blackmisc/testvectormatrixbase.h
@@ -15,7 +15,7 @@ namespace BlackMiscTest
 /*!
  * \brief Vector and Matrix classes basic tests
  */
-class CTestVectorMatrix : public QObject
+class CTestVectorMatrixBase : public QObject
 {
     Q_OBJECT
 
@@ -24,7 +24,7 @@ public:
      * \brief Standard test case constructor
      * \param parent
      */
-    explicit CTestVectorMatrix(QObject *parent = 0) : QObject(parent) {}
+    explicit CTestVectorMatrixBase(QObject *parent = 0) : QObject(parent) {}
 
 private slots:
     /*!