diff --git a/Polar.cpp b/Polar.cpp
index acdd506..c12ae96 100644
--- a/Polar.cpp
+++ b/Polar.cpp
@@ -35,20 +35,20 @@ Polar::Polar(Spherical s) {
 
 const Polar Polar::zero = Polar(0, 0);
 
-float Polar::Distance(const Polar &v1, const Polar &v2) {
-  float d =
-      Angle::CosineRuleSide(v1.distance, v2.distance, v2.angle - v1.angle);
+float Polar::Distance(Polar &v1, Polar &v2) {
+  float d = Angle::CosineRuleSide(v1.distance, v2.distance,
+                                  (float)v2.angle - (float)v1.angle);
   return d;
 }
 
-Polar Polar::operator+(const Polar &v2) const {
+Polar Polar::operator+(Polar &v2) {
   if (v2.distance == 0)
     return Polar(this->distance,
                  this->angle); // Polar(this->angle, this->distance);
   if (this->distance == 0)
     return v2;
 
-  float deltaAngle = Angle::Normalize(v2.angle - this->angle);
+  float deltaAngle = Angle::Normalize(v2.angle - (float)this->angle);
   float rotation = deltaAngle < 0 ? 180 + deltaAngle : 180 - deltaAngle;
 
   if (rotation == 180 && v2.distance > 0) {
@@ -64,24 +64,25 @@ Polar Polar::operator+(const Polar &v2) const {
   float angle =
       Angle::CosineRuleAngle(newDistance, this->distance, v2.distance);
 
-  float newAngle = deltaAngle < 0 ? Angle::Normalize(this->angle - angle)
-                                  : Angle::Normalize(this->angle + angle);
+  float newAngle =
+      deltaAngle < 0 ? (float)this->angle - angle : (float)this->angle + angle;
+  newAngle = Angle::Normalize(newAngle);
   Polar vector = Polar(newDistance, newAngle); // Polar(newAngle, newDistance);
   return vector;
 }
 
 Polar Polar::operator-() {
-  Polar vector =
-      Polar(this->distance,
-            this->angle - 180); // Polar(this->angle - 180, this->distance);
+  Polar vector = Polar(this->distance,
+                       (float)this->angle -
+                           180); // Polar(this->angle - 180, this->distance);
   return vector;
 }
 
-Polar Polar::operator-(const Polar &v2) const {
-  Polar vector =
-      *this + Polar(v2.distance,
-                    v2.angle - 180); //(Polar(v2.angle - 180, v2.distance));
-  return vector;
+Polar Polar::operator-(Polar &v2) {
+  // Polar vector = *this + Polar(v2.distance, (float)v2.angle - 180);
+  //(Polar(v2.angle - 180, v2.distance));
+  Polar vector = -v2;
+  return *this + v2;
 }
 
 Polar Polar::operator*(float f) const {
@@ -94,7 +95,7 @@ Polar Polar::operator/(const float &f) {
                this->angle); // Polar(this->angle, this->distance / f);
 }
 
-Polar Polar::Rotate(Polar v, float angle) {
+Polar Polar::Rotate(Polar v, Angle angle) {
   v.angle = Angle::Normalize(v.angle + angle);
   return v;
 }
\ No newline at end of file
diff --git a/Polar.h b/Polar.h
index 43b6c08..c77bb05 100644
--- a/Polar.h
+++ b/Polar.h
@@ -23,7 +23,7 @@ public:
   /// The angle in degrees, clockwise rotation
   /// </summary>
   /// The angle is normalized to -180 .. 180
-  float angle;
+  Angle angle;
   /// <summary>
   /// The distance in meters
   /// </summary>
@@ -70,14 +70,14 @@ public:
   /// </summary>
   /// <param name="v">The vector to subtract from this vector</param>
   /// <returns>The result of the subtraction</returns>
-  Polar operator-(const Polar &v) const;
+  Polar operator-(Polar &v);
 
   /// <summary>
   /// Add another polar vector to this polar vector
   /// </summary>
   /// <param name="v">The vector to add</param>
   /// <returns>The result of adding the vector</returns>
-  Polar operator+(const Polar &v) const;
+  Polar operator+(Polar &v);
 
   /// <summary>
   /// Scale the vector uniformly up
@@ -103,7 +103,7 @@ public:
   /// <param name="v1">The first vector</param>
   /// <param name="v2">The second vector</param>
   /// <returns>The distance between the two vectors</returns>
-  static float Distance(const Polar &v1, const Polar &v2);
+  static float Distance(Polar &v1, Polar &v2);
 
   /// <summary>
   /// Rotate the vector
@@ -111,7 +111,7 @@ public:
   /// <param name="v">The vector to rotate</param>
   /// <param name="angle">Angle in radias to rotate</param>
   /// <returns>The rotated vector</returns>
-  static Polar Rotate(Polar v, float angle);
+  static Polar Rotate(Polar v, Angle angle);
 };
 } // namespace Passer
 #include "Spherical.h"