From 4c0ed6d5f1318d22269ffc450023d0e7f6778ae0 Mon Sep 17 00:00:00 2001
From: Malcolm Robb <Support@ATTAvionics.com>
Date: Fri, 24 May 2013 11:10:16 +0100
Subject: [PATCH] Set AOG_VALID for DF-17/18 metype 19

---
 dump1090.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dump1090.c b/dump1090.c
index 243c21f..9543222 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -1898,6 +1898,9 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
 
         } else if (metype == 19) { // Airborne Velocity Message
 
+           // Presumably airborne if we get an Airborne Velocity Message
+            mm->bFlags |= MODES_ACFLAGS_AOG_VALID; 
+
             if ( (mesub >= 1) && (mesub <= 4) ) {
                 int vert_rate = ((msg[8] & 0x07) << 6) | (msg[9] >> 2);
                 if (vert_rate) {