From c9e3581fe242d4dbd00830fcb2f6d3f6d1ecccd1 Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Tue, 9 Nov 2021 16:41:20 +0100
Subject: [PATCH] heliwatch: don't track aircrafts without altitude

---
 heliwatch/src/adsb.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/heliwatch/src/adsb.rs b/heliwatch/src/adsb.rs
index c21bc3b..d4436f8 100644
--- a/heliwatch/src/adsb.rs
+++ b/heliwatch/src/adsb.rs
@@ -133,6 +133,10 @@ pub fn run(host: &'static str, port: u16, locations: Locations) -> Receiver<Even
                 let hex = format!("{}", icao_address);
                 let entry = entry.read().unwrap();
 
+                if entry.altitude.is_none() {
+                    continue;
+                }
+
                 if entry.altitude.map(|altitude| altitude > MAX_ALTITUDE).unwrap_or(false) ||
                     entry.emitter_category.as_ref().map(|category| IGNORED_CATEGORIES.contains(category)).unwrap_or(false)
                 {