From 88987608ae8841f86d0ac15f841dbc7e25f4c78d Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Thu, 5 Jul 2018 09:32:09 +1000
Subject: [PATCH] AP_OSD: display --- when no airspeed available

---
 libraries/AP_OSD/AP_OSD_Screen.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/AP_OSD/AP_OSD_Screen.cpp b/libraries/AP_OSD/AP_OSD_Screen.cpp
index 7872d73995..91f828625a 100644
--- a/libraries/AP_OSD/AP_OSD_Screen.cpp
+++ b/libraries/AP_OSD/AP_OSD_Screen.cpp
@@ -431,6 +431,8 @@ void AP_OSD_Screen::draw_aspeed(uint8_t x, uint8_t y)
     float aspd = 0.0f;
     if (AP::ahrs().airspeed_estimate(&aspd)) {
         backend->write(x, y, false, "A%4.0f%c", aspd * 3.6, SYM_KMH);
+    } else {
+        backend->write(x, y, false, "A ---%c", SYM_KMH);
     }
 }