From 44a21bc8ac7689a31dce62dab8d700439dbb4cc3 Mon Sep 17 00:00:00 2001
From: Pierre Kancir <pierre.kancir@azurdrones.com>
Date: Mon, 12 Feb 2018 12:29:10 +0100
Subject: [PATCH] EKF3: correct acos to acosf

---
 libraries/AP_NavEKF3/AP_NavEKF3_core.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
index c70a2a23b3..2fc605bf37 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_core.cpp
@@ -1630,7 +1630,7 @@ Vector3f NavEKF3_core::calcRotVecVariances()
         q3 = -q3;
     }
     float t2 = q0*q0;
-    float t3 = acos(q0);
+    float t3 = acosf(q0);
     float t4 = -t2+1.0f;
     float t5 = t2-1.0f;
     if ((t4 > 1e-9f) && (t5 < -1e-9f)) {