diff --git a/protobuf_definitions/message_formats.proto b/protobuf_definitions/message_formats.proto
index 218f0bfe..c52e900d 100644
--- a/protobuf_definitions/message_formats.proto
+++ b/protobuf_definitions/message_formats.proto
@@ -1063,6 +1063,7 @@ 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.
@@ -1356,6 +1357,7 @@ message MultibeamConfig {
   double salinity = 8; // Set water salinity (ppt). Defaults to zero in fresh water.
   GuestPortDeviceID device_id = 9; // Device ID of the sonar.
   uint32 bandwidth_limit = 10; // Network bandwidth limit (Mbit/s), applies only to Oculus devices.
+  uint32 color_filter = 12; // Index of the color filter used to render the sonar fan (0 = grayscale).
 }
 
 // Discovery message for multibeam sonar devices.