From 746ca91649fe09dd4674c67f3487eda3495b1b86 Mon Sep 17 00:00:00 2001
From: Tom Pittenger <tom.pittenger@intel.com>
Date: Tue, 9 Jan 2018 16:19:47 -0800
Subject: [PATCH] Plane: reset groundspeed_undershoot value when GPS is lost

If we lose GPS lock the gndspd undershoot value gets stuck at the last calculated value forever (until GPS locks again)
---
 ArduPlane/navigation.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ArduPlane/navigation.cpp b/ArduPlane/navigation.cpp
index 22d97b8aab..1a26dfe9a9 100644
--- a/ArduPlane/navigation.cpp
+++ b/ArduPlane/navigation.cpp
@@ -163,6 +163,8 @@ void Plane::calc_gndspeed_undershoot()
             float gndSpdFwd = yawVect * gndVel;
             groundspeed_undershoot = (aparm.min_gndspeed_cm > 0) ? (aparm.min_gndspeed_cm - gndSpdFwd*100) : 0;
         }
+    } else {
+    	groundspeed_undershoot = 0;
     }
 }