From 8b0db6a0f33927adc3a5903c63eeb89b4fda69ee Mon Sep 17 00:00:00 2001
From: Scott Bender <scott@scottbender.net>
Date: Wed, 28 Mar 2018 17:05:10 -0400
Subject: [PATCH] fix: subtract magneticVariation to from directionTrue to get
 directionMagnetic

---
 calcs/windDirectionMagnetic.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/calcs/windDirectionMagnetic.js b/calcs/windDirectionMagnetic.js
index deb3b0d..aadb52e 100644
--- a/calcs/windDirectionMagnetic.js
+++ b/calcs/windDirectionMagnetic.js
@@ -4,10 +4,10 @@ module.exports = function(app, plugin) {
   return {
     group: 'wind',
     optionKey: 'directionMagnetic',
-    title: "Magnetic Wind Direction (based on wind.directionTrue and magenticVarition)",
+    title: "Magnetic Wind Direction (based on wind.directionTrue and magneticVarition)",
     derivedFrom: [ "environment.wind.directionTrue", "navigation.magneticVariation" ],
     calculator: function(directionTrue, magneticVariation) {
-      var directionMagnetic = directionTrue + magneticVariation
+      var directionMagnetic = directionTrue - magneticVariation
       if ( directionMagnetic < 0 ) {
         directionMagnetic = (Math.PI*2) + directionMagnetic
       } else if ( directionMagnetic > (Math.PI*2) ) {