From a0a8c9b2f77990668564d9a8c9fe7b1d2a1623b5 Mon Sep 17 00:00:00 2001
From: "Novak, Marek" <Marek.Novak@Honeywell.com>
Date: Mon, 28 Jun 2021 17:21:33 +0200
Subject: [PATCH] Fix UnboundLocalError in airborne_velocity when velocity is
 zero

---
 pyModeS/decoder/bds/bds09.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pyModeS/decoder/bds/bds09.py b/pyModeS/decoder/bds/bds09.py
index c7302e4..e8d7673 100644
--- a/pyModeS/decoder/bds/bds09.py
+++ b/pyModeS/decoder/bds/bds09.py
@@ -65,8 +65,9 @@ def airborne_velocity(msg, source=False):
             trk = math.degrees(trk)  # convert to degrees
             trk = trk if trk >= 0 else trk + 360  # no negative val
 
+            trk_or_hdg = round(trk, 2)
+
         spd_type = "GS"
-        trk_or_hdg = round(trk, 2)
         dir_type = "TRUE_NORTH"
 
     else: