From ff57e4d2f683844854684a64f352c2a6dd366de4 Mon Sep 17 00:00:00 2001
From: Joshua Davidson <joshuadavidson2000@gmail.com>
Date: Thu, 21 Dec 2017 14:05:14 -0500
Subject: [PATCH] A3XX: FMGC: Fix missing drift-angle calculator, causing NAV
 to do bad tracking in crosswinds

---
 Systems/fmgc-drivers.xml | 15 ++++++++++++++-
 revision.txt             |  2 +-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Systems/fmgc-drivers.xml b/Systems/fmgc-drivers.xml
index c65b8ec9..381962c3 100644
--- a/Systems/fmgc-drivers.xml
+++ b/Systems/fmgc-drivers.xml
@@ -438,6 +438,19 @@
 		<output>/instrumentation/pfd/track-deg</output>
 	</filter>
 	
+	<filter>
+		<name>DRIFT ANGLE</name>
+		<type>gain</type>
+		<gain>1.0</gain>
+		<input>/orientation/track-magnetic-deg</input>
+		<reference>/orientation/heading-magnetic-deg</reference>
+		<output>/it-autoflight/internal/drift-angle-deg</output>
+		<period>
+			<min>-180</min>
+			<max>180</max>
+		</period>
+	</filter>
+	
 	<filter>
 		<name>HEADING ERROR DEG</name>
 		<debug>false</debug>
@@ -492,7 +505,7 @@
 				<sum>
 					<property>/autopilot/route-manager/wp[0]/true-bearing-deg</property>
 					<product>
-						<property>/autopilot/internal/drift-angle-deg</property>
+						<property>/it-autoflight/internal/drift-angle-deg</property>
 						<value>-1</value>
 					</product>
 					<product>
diff --git a/revision.txt b/revision.txt
index 1067581f..97885853 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-4106
\ No newline at end of file
+4107
\ No newline at end of file