diff --git a/IMC.xml b/IMC.xml
index e4eeaf9..9410d67 100644
--- a/IMC.xml
+++ b/IMC.xml
@@ -2079,6 +2079,102 @@
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+ Position and configuration of an LBL transponder (beacon). The LBL transponder may be fixed or mobile, depending on TTL value.
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+ Name/Label of the acoustic transponder.
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+ WGS-84 Latitude coordinate.
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+ WGS-84 Longitude coordinate.
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+ The beacon's depth.
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+ Interrogation channel.
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+ Reply channel.
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+ Transponder delay.
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+ Epoch time of this beacon configuration. For *ttl* seconds after this instant, position is estimated
+ to vary according to *vx*, *vy* and *vz*.
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+ Defines if LBL Beacon is fixed or mobile. If set to 0, LBL Beacon is fixed. Otherwise, it's the time,
+ in seconds, that the current position is considered valid.
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+ For mobile LBL Beacons. Ground Velocity xx axis velocity component.
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+ For mobile LBL Beacons. Ground Velocity yy axis velocity component.
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+ For mobile LBL Beacons. Ground Velocity zz axis velocity component.
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+ Long Base Line configuration.
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+ Used to define the type of the operation this message holds.
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+ Set the beacons configuration aboard the vehicle.
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+ Request the vehicle to send its current beacons configuration.
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+ Reply from vehicle with its current beacons configuration.
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+ Update the beacons position aboard the vehicle.
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+ A list of LBL Beacon Configuration Extended messages.
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Send an acoustic message.