From 42b47acdfcce3f76cf5d62a3fc5483b13081cf7a Mon Sep 17 00:00:00 2001
From: Paul Riseborough <p-riseborough@live.com.au>
Date: Mon, 9 Nov 2015 13:39:22 +1100
Subject: [PATCH] DataFlash: Fix logging error for EKF second instance

---
 libraries/DataFlash/LogFile.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/DataFlash/LogFile.cpp b/libraries/DataFlash/LogFile.cpp
index 2c198c2b5b..724e54103e 100644
--- a/libraries/DataFlash/LogFile.cpp
+++ b/libraries/DataFlash/LogFile.cpp
@@ -1492,6 +1492,7 @@ void DataFlash_Class::Log_Write_EKF2(AP_AHRS_NavEKF &ahrs, bool optFlowEnabled)
 
         // Write 9th EKF packet
         ahrs.get_NavEKF2().getVariances(1,velVar, posVar, hgtVar, magVar, tasVar, offset);
+        magLength = magVar.length();
         ahrs.get_NavEKF2().getFilterFaults(1,faultStatus);
         ahrs.get_NavEKF2().getFilterTimeouts(1,timeoutStatus);
         ahrs.get_NavEKF2().getFilterStatus(1,solutionStatus);