X-Git-Url: https://git.street.me.uk/andy/viking.git/blobdiff_plain/ab1e06931aa45edfe302f6a9cab91773b2444d4d..0eb26799f0090b0a294cf0a61d17ba94b8d19132:/src/globals.h

diff --git a/src/globals.h b/src/globals.h
index fb4d6f90..40d58d58 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -34,22 +34,26 @@
 
 #define VIK_FEET_IN_METER 3.2808399
 #define VIK_METERS_TO_FEET(X) ((X)*VIK_FEET_IN_METER)
-#define VIK_FEET_TO_METERS(X) (X/VIK_FEET_IN_METER)
+#define VIK_FEET_TO_METERS(X) ((X)/VIK_FEET_IN_METER)
+
+#define VIK_MILES_IN_METER 0.000621371192
+#define VIK_METERS_TO_MILES(X) ((X)*VIK_MILES_IN_METER)
+#define VIK_MILES_TO_METERS(X) ((X)/VIK_MILES_IN_METER)
 
 /* MPS - Metres Per Second */
 /* MPH - Metres Per Hour */
 #define VIK_MPH_IN_MPS 2.23693629
-#define VIK_MPS_TO_MPH(X) (X*VIK_MPH_IN_MPS)
-#define VIK_MPH_TO_MPS(X) (X/VIK_MPH_IN_MPS)
+#define VIK_MPS_TO_MPH(X) ((X)*VIK_MPH_IN_MPS)
+#define VIK_MPH_TO_MPS(X) ((X)/VIK_MPH_IN_MPS)
 
 /* KPH - Kilometres Per Hour */
 #define VIK_KPH_IN_MPS 3.6
-#define VIK_MPS_TO_KPH(X) (X*VIK_KPH_IN_MPS)
-#define VIK_KPH_TO_MPS(X) (X/VIK_KPH_IN_MPS)
+#define VIK_MPS_TO_KPH(X) ((X)*VIK_KPH_IN_MPS)
+#define VIK_KPH_TO_MPS(X) ((X)/VIK_KPH_IN_MPS)
 
 #define VIK_KNOTS_IN_MPS 1.94384449
-#define VIK_MPS_TO_KNOTS(X) (X*VIK_KNOTS_IN_MPS)
-#define VIK_KNOTS_TO_MPS(X) (X/VIK_KNOTS_IN_MPS)
+#define VIK_MPS_TO_KNOTS(X) ((X)*VIK_KNOTS_IN_MPS)
+#define VIK_KNOTS_TO_MPS(X) ((X)/VIK_KNOTS_IN_MPS)
 
 #define VIK_DEFAULT_ALTITUDE 0.0
 #define VIK_DEFAULT_DOP 0.0