diff --git a/src/NmeaParser/Nmea/NmeaMessage.cs b/src/NmeaParser/Nmea/NmeaMessage.cs
index 0c474e1..6566bca 100644
--- a/src/NmeaParser/Nmea/NmeaMessage.cs
+++ b/src/NmeaParser/Nmea/NmeaMessage.cs
@@ -188,6 +188,11 @@ namespace NmeaParser.Messages
 
             string[] parts = message.Split(new char[] { ',' });
             string MessageType = parts[0].Substring(1);
+            if (MessageType == "PTNL") {
+                // PTNL is parent to e.g. AVR, GGK etc.
+                MessageType = parts[1];
+                parts = parts.Skip(1).ToArray();
+            }
             if (MessageType == string.Empty)
                 throw new ArgumentException("Missing NMEA Message Type");
             string[] MessageParts = parts.Skip(1).ToArray();