diff --git a/protobuf_definitions/message_formats.proto b/protobuf_definitions/message_formats.proto
index 2296ccf5..223dd06f 100644
--- a/protobuf_definitions/message_formats.proto
+++ b/protobuf_definitions/message_formats.proto
@@ -805,6 +805,7 @@ enum GuestPortDeviceID {
   GUEST_PORT_DEVICE_ID_CERULEAN_OMNISCAN_450FS = 36; // Cerulean Omniscan 450 FS
   GUEST_PORT_DEVICE_ID_CERULEAN_OMNISCAN_450SS = 37; // Cerulean Omniscan 450 SS
   GUEST_PORT_DEVICE_ID_BLUEYE_GNSS_DEVICE = 38; // Blueye GNSS device
+  GUEST_PORT_DEVICE_ID_WATERLINKED_DVL_A50_600 = 39; // Waterlinked DVL A50 600m
 }
 
 // GuestPort number.