minor update

2017-07-21 16:02:40 +02:00
parent 0e29a4d18a
commit 27daf52850
2 changed files with 3 additions and 3 deletions
--- a/pyModeS/adsb.py
+++ b/pyModeS/adsb.py
@@ -678,9 +678,9 @@ def altitude_diff(msg):

    msgbin = util.hex2bin(msg)
    sign = -1 if int(msgbin[80]) else 1
-    value = util.bin2int(msgbin[81:88]) * 25
+    value = util.bin2int(msgbin[81:88])

    if value == 0 or value == 127:
        return None
    else:
-        return sign * value
+        return sign * (value - 1) * 25    # in ft.