diff --git a/lib/gdl90/ahrs_message.dart b/lib/gdl90/ahrs_message.dart
index 171c64d..fbe5eb9 100644
--- a/lib/gdl90/ahrs_message.dart
+++ b/lib/gdl90/ahrs_message.dart
@@ -4,6 +4,8 @@ import 'package:avaremp/pfd_painter.dart';
 
 import 'message.dart';
 
+bool isStratux = false;  // share state with message_factory.dart
+
 class AhrsMessage extends Message {
 
   double? aoa;
@@ -119,7 +121,8 @@ class AhrsMessage extends Message {
         double num;
         num = _combineBytesForFloat(m0, m1);
         if (num != 0x7FFF) {
-          roll = num / 10;
+          // roll = num / 10;
+          roll = (isStratux == true) ? -(num / 10) : (num / 10);  // reverse roll orientation
         }
         num = _combineBytesForFloat(m2, m3);
         if (num != 0x7FFF) {
@@ -156,4 +159,4 @@ class AhrsMessage extends Message {
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/lib/gdl90/message_factory.dart b/lib/gdl90/message_factory.dart
index d8e72de..c5ededb 100644
--- a/lib/gdl90/message_factory.dart
+++ b/lib/gdl90/message_factory.dart
@@ -26,6 +26,9 @@ class MessageFactory
     switch (type) {
       case MessageType.heartBeat:
         break;
+      case MessageType.heartBeatStratux:
+        isStratux = true;
+        break;
       case MessageType.uplink:
         m = UplinkMessage(type);
       case MessageType.ownShip:
@@ -96,6 +99,7 @@ class MessageFactory
 
 class MessageType {
   static const int heartBeat = 0x00;
+  static const int heartBeatStratux = 0xCC;  // per https://github.com/cyoung/stratux/blob/master/notes/app-vendor-integration.md
   static const int uplink = 0x07;
   static const int ownShip = 0x0A;
   static const int ownShipGeometricAltitude = 0x0B;