Stakhanov wrote: » There are two slots on the side of the helmet slot , put signals and other utility (like compass and thermometer) there.
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This will give you the location of a point of interest into several biomes ...
As Stakhanov stated it, this is precisely where you have to put the signals you found (an image to help you, if needed)
For the moment, we do not have much informations about these signals (Subnautica Wiki)