Change speed units to kph (from knots)

Author: sandeepmistry

examples/GPSLocation/GPSLocation.ino

@@ -39,7 +39,7 @@ void loop() {
 
     Serial.print("Ground speed: ");
     Serial.print(GPS.speed());
-    Serial.println(" knots");
+    Serial.println(" km/h");
 
     Serial.print("Number of satellites: ");
     Serial.println(GPS.satellites());

src/GPS.cpp

@@ -95,7 +95,8 @@ float GPSClass::longitude()
 
 float GPSClass::speed()
 {
-  return _speed;
+  // convert speed from knots to kph
+  return _speed * 1.852;
 }
 
 float GPSClass::course()

src/GPS.h

@@ -34,7 +34,7 @@ class GPSClass {
 
   float latitude();
   float longitude();
-  float speed(); // Speed over the ground in knots
+  float speed(); // Speed over the ground in kph
   float course(); // Track angle in degrees
   float variation(); // Magnetic Variation
   float altitude();