From 1958b23a93d18d33c4e8225a0dbea10e3464235a Mon Sep 17 00:00:00 2001
From: Oliver Jowett <oliver@mutability.co.uk>
Date: Fri, 2 Sep 2016 18:45:39 +0100
Subject: [PATCH] Tweak the on-the-ground conditions a little.

---
 net_io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net_io.c b/net_io.c
index 7dc7fcb..9c4139f 100644
--- a/net_io.c
+++ b/net_io.c
@@ -1837,7 +1837,8 @@ static void writeFATSV()
             // don't send mode S very often
             minAge = 30000;
         } else if ((airgroundValid && a->airground == AG_GROUND) ||
-                   (altValid && a->altitude < 500 && speedValid && a->speed < 100)) {
+                   (altValid && a->altitude < 500 && (!speedValid || a->speed < 200)) ||
+                   (speedValid && a->speed < 100 && (!altValid || a->altitude < 1000))) {
             // we are probably on the ground, increase the update rate
             minAge = 1000;
         } else if (!altValid || a->altitude < 10000) {