diff --git a/pyModeS/decoder/ehs.py b/pyModeS/decoder/ehs.py
index 7515b39..0d5e2f7 100644
--- a/pyModeS/decoder/ehs.py
+++ b/pyModeS/decoder/ehs.py
@@ -627,7 +627,7 @@ def trk50(msg):
     if trk < 0:
         trk = 360 + trk
 
-    return round(trk, 1)
+    return round(trk, 3)
 
 
 def gs50(msg):
@@ -775,7 +775,7 @@ def hdg53(msg):
     if hdg < 0:
         hdg = 360 + hdg
 
-    return round(hdg, 1)
+    return round(hdg, 3)
 
 
 def ias53(msg):
@@ -938,7 +938,7 @@ def hdg60(msg):
     if hdg < 0:
         hdg = 360 + hdg
 
-    return round(hdg, 1)
+    return round(hdg, 3)
 
 
 def ias60(msg):