diff --git a/protobuf_definitions/message_formats.proto b/protobuf_definitions/message_formats.proto
index c7f1924b..02d0e3db 100644
--- a/protobuf_definitions/message_formats.proto
+++ b/protobuf_definitions/message_formats.proto
@@ -1154,6 +1154,7 @@ message OverlayParameters {
   string subtitle = 14; // Optional subtitle.
   string date_format = 16; // Posix strftime format string for time stamp.
   float shading = 17; // Pixel intensity to subtract from text background (0..1), 0: transparent, 1: black.
+  bool multibeam_enabled = 25; // If the multibeam sonar fan overlay should be drawn onto the recording.
 }
 
 // Complete set of supported guest port devices.